Question

In tomatoes, red fruit (R) is dominant to yellow fruit (r). Round fruit (B) is dominant...

In tomatoes, red fruit (R) is dominant to yellow fruit (r). Round fruit (B) is dominant to pear-shaped fruit (b).
Cross a heterozygous red, round tomato plant with another plant of the same genotype.

Now, answer the following questions based on the above cross done by you:
1. What is the genotype of the first parent?

2. What is the genotype of the second parent?

3. What is the probability of getting heterozygous red and round fruit in the offspring?

4. What is the probability of getting homozygous red and round fruit in the offspring?

5. What fraction of the offspring should be red?

6. What fraction of the offspring should be yellow?

7. What fraction of the offspring should be round?

8. What fraction of the offspring should be pear-shaped?
9. What is the probability of getting offspring that have red and pear-shaped fruit?

10. What is the probability of getting offspring that have yellow fruit that is round?

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Homework Answers

Answer #1
RrBb(red,round) RB Rb rB rb
RB RRBB(red,round) RRBb(red,round) RrBB(red,round) RrBb(red,round)
Rb RRBb(red,round) RRbb(red,pear shaped) RrBb(red,round) Rrbb(red,pear shaped)
rB RrBB(red,round) RrBb(red,round) rrBB(yellow,round) rrBb(yellow,round)
rb RrBb(red,round) Rrbb(red,pear shaped) rrBb(yellow,round) rrbb(yellow,pear shaped)

1. What is the genotype of the first parent?

ans : RrBb

2. What is the genotype of the second parent?

ans : RrBb

3. What is the probability of getting heterozygous red and round fruit in the offspring?

ans : 1/4

4. What is the probability of getting homozygous red and round fruit in the offspring?

ans : 1/16

5. What fraction of the offspring should be red?

ans : 3/4

6. What fraction of the offspring should be yellow?

ans : 1/4

7. What fraction of the offspring should be round?

ans : 3/4

8. What fraction of the offspring should be pear-shaped?

ans : 1/4
9. What is the probability of getting offspring that have red and pear-shaped fruit?

ans : 3/16

10. What is the probability of getting offspring that have yellow fruit that is round?

ans : 3/16

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