Question

in tomato plants, round shape (R) is dominant to wrinkled (r) Yellow color (Y) is dominant to green (y). If heterozygous plants cross with recessive homozygous plants will give phenotype ratio of:
A. 1:1:1:1
B. 9:3:3:1
C. 9:3:4
D. 12:3:1
E. 15:1

Answer 1

Answer to the questions #43282, Biology, Other

Question: in tomato plants, round shape (R) is dominant to wrinkled (r) Yellow color (Y) is dominant to green (y). If heterozygous plants cross with recessive homozygous plants will give phenotype ratio of:

A. 1:1:1:1

B. 9:3:3:1

C. 9:3:4

D. 12:3:1

E. 15:1

Answer:

A. RrYy x rryy

↓

1 RrYy

1 rrYy

1 Rryy

1 rryy

In the case of independent inheritance, actually, two analytical crossing occur. The probability for each allele to be transmitted to the next generation is $\frac{1}{2}$. As two non-linked loci are studied, each phenotype will occur with equal probability ($\frac{1}{2} \times \frac{1}{2} = \frac{1}{4}$).

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