Genetics Answers

Explain in detail how and why the structure of the human chromosome relates to the function. Your explanations must include: 

• centromere 

• chromatids

• autosomes

• sex chromosomes

• chromosome number

• homologous

• non-homologous chromosom

Research 3 recent studies relating to any of the following ‘Evolutionary Thoughts/Evidences’ found below. Afterwards, briefly discuss how they support the Theory of Evolution. Write the title and the name of the author followed by your discussions. Include the references at the end of the research. Limit your answer to 7-10 sentences per study. Be guided with the criteria (3 items, 10 points each)

1. Paleontology
2. Geographical distribution
3. Comparative anatomy
4. Comparative embryology
5. Biochemistry
6. DNA homology

What are the chances of pulling red marble out of the bag containing the following marbles 4 red marbles, 3 yellow marbles, 3 green marbles

5. A rooster with grey feathers is mated with a hen of the same phenotype. Among their offspring 15 chicks are grey, 6 are black and 8 are white.

a. What is the simplest explanation for the inheritance of these colors in chickens? (3 points)

b. What offspring would you expect from the mating of a grey rooster and a black hen? (4 points punnett square; 6 points GR and PR)

4. Colorblindness is an X-linked trait caused by a recessive allele. A carrier female marries a normal male. (Punnett Square: 4 points)

a. How many of the male offspring can be expected to be color-blind? (1 point)

b. How many of the male offspring can be expected to have normal vision? (1 point)

c. How many of the female offspring can be expected to be carriers? (1 point)

d. How many of the female offspring can be expected to be normal? (1 point)

3. In the early 1940s, famed entertainer Charlie Chaplin was taken to court in a paternity case brought by his former protege, Joan Berry. Berry was 23 and Chaplin 54, and she alleged that he was the father of her newborn baby, Carol Ann. Charlie Chaplin’s blood type was already on record as type AB. The mother of the child had type A and her child had type O blood.

a. Complete a Punnett square for the possible cross of Charlie and the mother. (4 points each punnett square. You have to prepare two punnett squares)

b. The judge ruled in favor of the mother and ordered Charlie Chaplin to pay child support costs of the child. Was the judge correct in his decision based on blood typing evidence? Explain why or why not. (3 points)

B. Answer the following question comprehensively. Be guided by the following criteria. 

*Answer in 7-10 sentences only. Underline your keywords.

1. Is genetic engineering a blessing or a curse? Support your answer using the given examples and some news that you might have encountered about the advantages and/or disadvantages of GMO’s. You can also read more about GMO’s if you can access other resources.

A. Read and analyze the following genetic problem. Answer what is being asked. Show complete solution in a separate paper then take a picture and upload it here.(Genotypes of P, Punnett Square and GR, PR).

4. In the fruit fly Drosophila melanogaster, vestigial wings and hairy body are produced by two recessive genes located on different chromosomes. The normal alleles, long wings and hairless body, are dominant. Give the genotype and phenotype of F1 progeny obtained from a cross between a vestigial-winged, hairy male and a normal, homozygous female. Note: You may use your own letters to signify the alleles.

A. Read and analyze the following genetic problem. Answer what is being asked. Show complete solution in a separate paper then take a picture and upload it here.(Genotypes of P, Punnett Square and GR, PR).

1. In Coleus, some plants have shallowly crenated edges and others have deeply incised leaves. A cross is made between homozygous deep and shallow individuals. The shallow trait is dominant. Using S and s to symbolize the genes for this trait, give the phenotypic and genotypic ratios for the F1 generation.

2. If you crossed a heterozygous spotted lizard with a homozygous green lizard, what percentage of their offspring would be green and what percentage would be spotted? Note: You may use your own letters to signify the alleles.

are genes located in the same area as homozygous cells?