a cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for…

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?\no 1 in 4\no 2 in 4\no 3 in 4\no 4 in 4

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?\no 1 in 4\no 2 in 4\no 3 in 4\no 4 in 4

Answer

Answer:

B. 2 in 4

Explanation:

Step1: Define alleles

Let R be allele for red and B for blue.

Step2: First - cross result

Homozygous red (RR) × homozygous blue (BB) gives all RB (purple) offspring due to incomplete - dominance.

Step3: Second - cross setup

Crossing two purple (RB) birds: RB × RB.

Step4: Use Punnett - square

The Punnett - square for RB × RB gives genotypes: 1RR:2RB:1BB.

Step5: Determine purple proportion

Since RB is purple, 2 out of 4 offspring are purple.