Question

a cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result due to incomplete dominance. then, two of the purple offspring are crossed. what proportion of the offspring from the second cross will be purple?
○ 1 in 4
○ 2 in 4
○ 3 in 4
○ 4 in 4

Explanation:

Step1: Define Genotypes

Let red be \( RR \), blue be \( BB \). Purple (incomplete dominance) is \( RB \).

Step2: Cross Purple Offspring

Cross \( RB \times RB \). Punnett square:

	R	B
B	RB	BB

Step3: Calculate Purple Proportion

Purple (\( RB \)) occurs 2 times out of 4. So proportion is \( \frac{2}{4} \).

Answer:

2 in 4