Answer:
Meiosis I, a reductional division of two haploid cells produces offspring cells that are not genetically identical with the event of recombination. Haploid girl cells have half the original/parent cell chromosomes.
Explanation:
meiosis II, an equational or mitotic division, divides the haploid cells created in meiosis I to produce four identical daughter cells that ultimately form the male/female gametes (egg/sperm).
Here chromatids split in contrast to meiosis I when homologous chromosomes apart.
HELP ITS EASY JUST THAT IM DUM-B
What is true about these two brothers that have brown eyes: One has genotype (BB) the other (Bb). B=brown eyes b= blue eyes
A) The brothers have the same phenotype and genotype
B) The brothers have different genotypes and phenotypes
C) The brothers have the same phenotype but different genotypes
D) The brothers have the same genotype but different phenotypes
Answer:
C
Explanation:
If a female fruit fly heterozygous for red eyes (X RX r) crossed with a white-eyed male (X rY), what percent of their offspring would have white eyes? (Draw a Punnett Square.)
Answer:
6.25%
Explanation:
Given that:
The trait of a female fruit fly that is heterozygous for red eyes = XRXr; &
The trait of a white-eyed male is XrY_ ;
since Y is dominant y; the male trait can either be XrYR or XrYr
So, let assume that it is XrYr
Then; if each trait self crossed; we have:
XRXr = XX Xr XR Rr
XrYr = XY Xr rY rr
Thus, the punnet Square can be computed as:
XX Xr XR Rr
XY XXXY XXYr XXYR XRYr
Xr XXXr XXrr XXRr XRrr
rY XrYX XxYr XrYR RrYr
rr XrXr Xrrr XrRr Rrrr
∴
the percentage of offspring that would have white eyes XrY_ is:
1/16 = 0.0625
= 6.25%
Describe the ways mutations can affect DNA and chromosomes.
The mutation affects DNA and chromosomes by changes in the sequence of DNA or changes in the gene present on the chromosome.
What is mutation?The mutation is a sudden change in the structure of chromosomes or DNA. The smaller mutation affects the nucleotide base in DNA, while the larger mutation affects the genes present on the chromosomes.
The substance which causes mutation is known as mutagens. Mutation can cause problems in growth and development and affects the functioning of the body. When changes occur in chromosomes or DNA, they cause changes in the protein. Due to this, a different kind of protein is produced.
The mutation is caused by the insertion, duplication, deletion, and substitutions of a DNA sequence. Thus, mutation can affect DNA and chromosome in many ways.
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When lions prey on a herd of antelopes, some antelopes are killed and some escape and live to reproduce. Which of the following statements best describes this situation?
A. Natural selection is a random process.
B. Individuals with the best adaptations survive long enough to have offspring.
C. Species remain unchanged throughout time.
D. Individuals pass along acquired characteristics to the next generation.
Answer:
B.
Explanation:
11. How has our misguided, or inappropriate, use of antibiotics led to the development of organisms like
MRSA and VRSA?
Answer:
1. use of the wrong antibiotic
2. use of insufficient concentration of the right antibiotic
Explanation:
MRSA means Methicillin-resistant staphylococcus aureus
VRSA means Vancomycin-resistant Staphylococcus aureus
These are resistant forms of the bacteria Staphylococcus aureus to the antibiotics mentioned.
Bacterial resistance to antibiotics occurs when bacteria develop mechanisms that protect them against the effects of previously effective antibiotics.
Misguided and inappropriate use of antibiotics results in resistance, and they mainly occur as a result of two activities:
1. Use of wrong antibiotics: antibiotics are chosen using a microbiological technique called 'sensitivity testing', to determine which antibiotic is effective against a bacterium. However, when antibiotics are taken without proper sensitivity testing, the bacteria develop resistance against such antibiotics.
2. Use of inadequate concentration of the right antibiotic: This involves using less than the minimum inhibitory of minimum bactericidal concentration of an antibiotic against a bacteria. In this case, the organism has ample time to evolve in the presence of the antibiotic, hence the occurrence of resistance.
When the trading of equivalent sections of DNA between homologous chromosomes occurs during crossing over, it is called:
A. reciprocal exchange.
B. chromosomal exchange.
C. allele exchange.
D. similar crossing-over.
Answer:
chromosomal exchange i hope it helps you
Please can I get some help on this? please?
1. If the ecosystem is balanced, which populations should be the largest? Which should be the smallest?
2. Why can the wolf be considered both a secondary consumer and a tertiary consumer?
3. If the original amount of energy found in the producer trophic level is 100 kcal how much is passed on to the primary consumer trophic level? How does this amount limit the number of members in the next higher level?
4. Analyze what would happen to this ecosystem if one of the primary consumers was removed from the ecosystem? What would happen if a new tertiary consumer such as a mountain lion came into the ecosystem? Describe how each level would be affected if each of these changes occurred.
Answer:
1. producers are the largest and consumers are the least
2. because wolves feed on both primary and secondary consumers
3. Only 10% of energy from each trophic level is passed on to the next; therefore, the energy passed to the primary consumer will be only 10 kcal.
4. disturbe,as we know that secondary consumers feed on primary consumers so if there is no primary consumers then all secondary consumers will die similarly all tertiary consumers will also die and life would be finish on the earth.
if a new tertiary consumer came into the ecosystem then it will create a problem as the number of primary and secondary consumer are same but the tertiary consumer are more so they will get less food and hence die
3 and 4 are help from others in brainly, good luck in your class
need help will give brainlist
Answer:
B. Invasive Species
hope this helps :)
Specialized cells have different dna from other specialized cells
Answer: for example in a nerve cell are different from the genes that are expressed in a muscle cell. Both cells have the same DNA, but expressing different genes generates different cell types.
Explanation:
Where are the 36 ATP come from during cellular respiration?
A. 2 from glycolysis, 2 from oxidation of pyruvate and 32 from Krebs cycle
B. 2 from glycolysis, 2 from Krebs cycle and 32 from electron transport chain
C. 2 from glycolysis, 2 from oxidation of pyruvate and 32 from electron transport chain
D. 2 from oxidation of pyruvate, 2 from Krebs cycle and 32 from electron transport chain
Name the stages of mitosis!
Answer:
Today, mitosis is understood to involve five phases, based on the physical state of the chromosomes and spindle. These phases are prophase, prometaphase, metaphase, anaphase, and telophase.
Explanation:
Answer: Mitosis actually occurs in four phases. The phases are called prophase, metaphase, anaphase, and telophase
HELP ME I WILL GIVE BRAINIST AWANERR AND On a separate sheet of paper, choose three animals, one that lives in water, one that lives on
land, and one that flies. Explain how each one moves and how it is uniquely adapted for
movement within its environment.
Answer and Explanation:
Land - Lion
Water - Sealion
Flies - Bees
Lions have strong retractable jaws that help them eat their prey and that way they adapt to their enviroment.
The Sealion's thick, oily fur and a layer of blubber allow them to keep a high temperature in cold waters.
A Bees body carries an electrostatic charge that attracts pollen and that way they can keep it in them.
Hope this Helps! Have a GREAT day!
HELP ASAP!!
Which scenario is an example of an environmental problem becoming an
economic problem?
O A. Excessive pollution decreases a community's access to affordable
clean water.
O B. Destruction of habitat reduces a population of animals in a remote
ecosystem.
O C. Deforestation creates farmland that allows a community to
produce more crops.
O D. Excessive manufacturing of a product reduces demand in a
saturated market.
Answer: A, excessive pollution decreases a communities access to affordable clean water.
Explanation: ap3x
Answer:
O A. Excessive pollution decreases a community's access to affordable
clean water.
Explanation:
Above answer is absolutely correct! I just want to assure you :)
3.A subunit of DNA that consists of a sugar, a phosphate,
and a nitrogenous base____
A. Thymine
B. Nucleotide
C. Amino acid
Answer:thymine
Explanation:
thymine is in the DNA
Answer:
Nucleotide
Explanation:
Thymine is a nitrogen base, and amino acid is a building block for protein. A nucleotide is made up of a sugar, a phosphate, and a nitrogenous base.
a crow vending machine is associated with what type of learning
Sorry you've waited so long for an answer! I belive the type of learning associated with a crow vending machine is trial and error! So sorry once again!
Which of the following might be an adaptation for a predator? AS SOON AS POSSIBLE NEED HELP PLS THX
Answer:
we need the answers
Explanation:
Answer:
Many predators have adaptations that help them survive in the wild. For example, the snake shown below has camoflauge coloring to look like its surroundings. This gives it the element of surprise when going to attack its prey. These adaptations help the predator in hunting for food. Predators have "weapons", or adaptations, that help them hunt and kill prey. Predators' three main "weapons" are teeth, claws, and jaws. The lion below has all 3 of these "weapons" or adaptations that are used for catching its prey. A lion has sharp claws for catching and grabbing hold prey such as a zebra, and strong jaws and teeth for biting and killing the zebra and for ripping off and chewing the meat.
Explanation:
Hope this helps.
Malaria is caused by plasmodium carried by _____.
mosquitoes
fungi
amoeba
flies
Answer:
mosquitosExplanation:
they carry plasmodium
are proteins that are found on the surface of some red blood cells,
A hemisphere experiences summer when _____________ .
A) it is tilted toward the Sun
B) it is tilted away from the Sun
Answer:
A
Explanation:
tilted towards sun....
what is a cell organelle that has the same function as the urinary bladder?
The cell organelle that has the same function as the urinary bladder is the lysosome.
What are lysosomes?This is a spherical sac-shaped cell organelle surrounded by a single membrane. (Unlike chloroplasts and mitochondrial membranes, which have two membranes.)
It contains hydrolytic digestive enzymes, which split molecules by the addition of water molecules. Autolysis/autophagy, which is the automatic discharge of digestive enzymes in a contained cell that destroys the entire cell, separates the digestive enzymes from other cell organelles.
Plant and animal cells both include lysosomes. The lysosome degrades or eliminates worn-out or damaged organelles. Waste management is something that serves the same purpose.
Therefore, the lysosome is a cell organelle that performs the same job as the urine bladder.
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Which stage of the cell cycle lasts longest?
Answer: i think the Interphase because
Interphase is the longest part of the cell cycle. This is when the cell grows and copies its DNA before moving into mitosis. During mitosis, chromosomes will align, separate, and move into new daughter cells. The prefix inter- means between, so interphase takes place between one mitotic (M) phase and the next.
Explanation:
hope this helps have a nice day ❤️❤️❤️❤️
Answer:
Metaphase
Explanation:
hope this helps!!!
are bacteria prokaryotes of eukaryotic
Answer:
well they can be both sometimes, some can survive in very hot environments, but most can be killed by heat so it is prokaryotic
Explanation:
Which of these is an effect of desertification? A loss of fertile land to farm B more farmland to grow food C more biodiversity worldwide D cooler global temperatures
Which size cells are more efficient at obtaining nutrients?
what is the scientific name for human??
Answer:
HomoSapiens
Explanation:
How many reactions that occur in kreb cycle transfer electrons from substrate to an electron acccepting enzyme
Answer:
Four reactions that occur in kreb cycle transfer electrons from substrate to an electron accepting enzyme.
Explanation:
There is four such a response in which electron is transported from substrate to electron-allowing enzyme. In three of those, NAD+ is decreased to NADH and in one FAD decreases to FADH2. The TCA cycle is likewise recognized as the Krebs cycle after the signature of English biochemist Hans Kreb who illustrated the pathway in the 1930s.
4. Why does cell division take place in single celled organisms?
A In order for organisms to grow
B.te reproduce and pass along genetic information
C.to enable the organisms to heal injured tissues
D.to make specialized cells for different functions
Answer:
A) In order for organisms to grow.
Explanation:
Tell me if I am wrong. I hope this helps :)
Cell division in a cell takes place in the single-celled organisms to reproduce and pass along the genetic information of the cell. Thus, the correct option is B.
What is Cell division?Cell division is the process of division of cell through which a parent cell divides into two daughter cells with equal genetic content which are similar to the parent cell. Cell division generally occurs as a part of a larger cell cycle in which the cell grows in size and the cell replicates the chromosomal material before it is undergoing cell division.
In the unicellular organisms, cellular division is a significant process through which a unicellular organism undergoes development and result into the formation of a new organism with genetic material which is similar to the parent cell. In the multicellular organisms, process of cellular division helps in maintaining a balance between the genetic material such as the DNA and the RNA contents as well as the nuclear and cytoplasmic contents of the cell.
Therefore, the correct option is B.
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How can the freezing of surface waters make the water that is left unfrozen denser
Explanation:
When an aqueous solution freezes, the unfrozen solution becomes denser. That's because some of the water has been removed as ice. However, the solutes remain dissolved in a solution with a smaller liquid volume. The concentration of the solution increases, so the density increases.
this is because water expands as it gets cold hence floating leaving the unfrozen water dense
Does DNA in animals and plants use the same nitrogenous base pairs?
Answer: There are pretty obvious differences between plants and animals, but – at the chemical level – the cells of all plants and all animals contain DNA in the same shape – the famous “double helix” that looks like a twisted ladder. What’s more, all DNA molecules – in both plants and animals – are made from the same four chemical building blocks – called nucleotides.
Explanation: hope this helps but if you need more information go the website down below
https://earthsky.org/earth/dna-animals-plants
in what ways does the domestic cat appear to be adapted to where and how it lives?
Answer:
Over time the Cat gets used to it's surroundings and routines of the people around it, soon the cat adapts to these surroundings.
Explanation: