Question

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Answer 1

Answer: Phenotype ratio is two heterozygous round pea : two homozygous wrinkled pea

Probability of getting a wrinkled pea is 1/2

The number of flowers that are homozygous is 2

The probability of getting a round pea is 1/2

Genotype ratio = 2 Rr : 2 rr

Explanation: From the information provided, round pea R is dominant while wrinkled pea r is recessive. A monohybrid cross between a heterozygous round pea Rr and a homozygous wrinkled pea rr will produce four offsprings, two of which are heterozygous round pea Rr and the other two are homozygous wrinkled pea rr.

The genotype ratio is 2 Rr : 2 rr while the phenotype ratio is two heterozygous round pea : two homozygous wrinkled pea. Heterozygous round (Rr) peas will manifest outwardly as round pea because R is dominant while r is recessive.

Since two out of the four offsprings are homozygous wrinkled pea, therefore the probability of getting a wrinkled pea is 2/4 = 1/2. Also, two out of the four offsprings are heterozygous round pea, therefore the probability of getting a round pea is 2/4 =1/2.

Since, only the two wrinkled peas are homozygous, therefore the number of flowers that are homozygous is 2