Question

Critical Thinking:

Trait F is the Mendelian trait for freckles, where F is dominant over f.
• Timmy is homozygous dominant for trait F.
• Timmy mates with Sally who is heterozygous for trait F.
• Timmy's father and Timmy's mother are both heterozygous for trait F.
• Timmy's maternal grandmother (mother's mother) is homozygous recessive for trait F.
• Timmy's maternal grandfather (mother's father) is homozygous dominant for trait F.
Use the information provided to complete the three separate Punnett squares on p. 69 of your lab manual.

Use the Punnett squares you completed in Exercise 1 on p.69 of your lab manual to answer Parts a and b.

QUESTION 1
. Timmy was homozygous dominant for the freckles trait. Looking at the Punnett square for his parents' mating, what was the probability of Timmy having a different genotype? What was the probability of Timmy having a different phenotype?

a)different genotype: 0%, different phenotype: 0%

b)different genotype: 50%, different phenotype: 50%

c)different genotype: 75%, different phenotype: 25%

D)different genotype: 25%, different phenotype: 75%

QUESTION 2
Timmy's mother was heterozygous for the freckles trait. Looking at the Punnett square for his grandparents' mating, what was the probability of Timmy's mother having a different genotype? What was the probability of Timmy's mother having a different phenotype?

a)different genotype: 25%, different phenotype: 75%

b)different genotype: 50%, different phenotype: 50%

c)different genotype: 0%, different phenotype: 0%

d)different genotype: 75%, different phenotype: 25%

Answer 1

Solution of both question is in uploaded pictures.

Ans 1- B (Both 50%)

Ans2- C (Both 0%)

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