Question

punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. a parakeet that is heterozygous for blue feathers (dominant) is crossed with a parakeet that is homozygous for white feathers (recessive). according to the punnett square for this cross, what percentage of offspring is predicted to have blue feathers? 25 percent 50 percent

Explanation:

Step1: Define alleles

Let \( B \) represent the allele for blue feathers (dominant) and \( b \) represent the allele for white feathers (recessive). The heterozygous parakeet has the genotype \( Bb \), and the homozygous parakeet for white feathers has the genotype \( bb \).

Step2: Create Punnett square

	\( B \)	\( b \)
\( b \)	\( Bb \)	\( bb \)

Step3: Calculate probability

Out of 4 possible offspring genotypes (\( Bb, Bb, bb, bb \)), 2 have the \( Bb \) genotype (which shows the dominant blue - feathered trait). The probability is \( \frac{2}{4}=\frac{1}{2} = 50\%\).

Answer:

50 percent