Due Monday April 10.2017, in class at noon Please show your work on all problems

Question

Due Monday April 10.2017, in class at noon Please show your work on all problems No credit will be given only the answer is provided. You wil need to use a separate sheet of paper 1. In pea plants, tall plants are dominant and dwarf plants are recessive. A heterozygous tall plant is crossed with a homozygous dwarf plant. What are the F1 genotypic and phenotypic ratios? 2. For guinea pigs, black coat color is dominant over white coat color. If a heterozygous guinea pig mates with another heterozy gous guinea pig, what possible coat color can offisprings have? 3. In pea plants, tall plants are dominant and dwarf plants are recessive. If two tall plants are crossed the resulting offsprings are ¾ tall and ¼ dwarf State the genotype of the parents. 4. A gene for normal hearing is dominant over the gene for deafness, A deaf person marries a person with normal hearing. But the person with normal hearing had a father that was also deaf. What are the possible phenotupes of the couple's children? A brown eyed man moth erhadblaremmames woman with blue eyes. What eye color could their kids have? 6. Blue flowvers are dominant over white flowers. Two plants with blue flowers are crossed. A total of 200 offipring plants are produced. 150 of these plants are blue and 50 are white What are the 7. In corn plants, black com kemels are dominant over yellow kemels. Also, round kemels are dominant over wrinkled kernels. Perform the following dihybrid cross. State the predicted phenotypic ratios 8. In com plants, black com kemels are dominant over yellow kemels. Also, round kemels ane dominant over wrinkled kernels. Perform the following diby brid cross. State the predicted phenotypic ratios a. BBRr x bbr 9. In humans, the gene for the ability to taste pheny lhiocarbamide (PTC) in domupant over that for the inability to taste PTC. The gene for brown eyes is dominant ower that for blue eyes. What proportion of the offiprings of tvo parents.each heterozy gosun for both traits, would be blue-eyed tasters? 10 In hunans, normal pimentation is due to a domunant gene, albinism toa recessine gene. A normal What is the probability that their next child will be an albine

Explanation / Answer

1. Let 'T' be the dominant allele and 't' be the recessive allele.

Tt x tt

Punnett square analysis:

The phenotypic ratio of F1 generation is - Tall : dwarf = 1:1

The genotypic ratio of F1 geneation is - Tt : tt = 1:1

2. Let 'B' be the dominant allele and 'b' be te recessive allele.

Bb x Bb

Punnett square analysis:

The offspring will have both black and white coat color.

T t t Tt tt t Tt tt

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