Question

question 5 of 10
in a species of snails, the allele for pink - colored shells is dominant over the allele for yellow - colored shells. if two heterozygotes are crossed, what is the probability that an offspring will have a pink shell?
a. 0.75
b. 0.25
c. 0.00
d. 0.50

Explanation:

Step1: Define alleles

Let \( P \) (pink - dominant) and \( p \) (yellow - recessive). Heterozygotes have genotype \( Pp \).

Step2: Create Punnett square

Parents: \( Pp\times Pp \). The Punnett square has \( PP, Pp, Pp, pp \) as offspring genotypes.

Step3: Calculate probability

Genotypes \( PP, Pp, Pp \) (pink) out of 4. Probability \(=\frac{3}{4}= 0.75\).

Answer:

A. 0.75