Question

in pigeons, feather color is influenced by a sex - linked gene located on the z chromosome. the allele b produces blue feathers, while the allele b produces brown feathers. pigeons have a zw sex - determination system, where males are zz and females are zw. a blue male pigeon (genotype z^bz^b) is crossed with a brown female pigeon (genotype z^bw). what is the probability that a male offspring will have brown feathers? 50% 0% 25% 100%

Explanation:

Step1: Determine Gametes

Male (\(Z^BZ^B\)) produces only \(Z^B\) gametes. Female (\(Z^bW\)) produces \(Z^b\) and \(W\) gametes.

Step2: Analyze Male Offspring Genotype

Male offspring get one \(Z\) from male (\(Z^B\)) and one \(Z\) from female (\(Z^b\)), so genotype is \(Z^BZ^b\). The \(B\) allele (blue) is dominant over \(b\) (brown), so phenotype is blue.

Step3: Calculate Probability

Since all male offspring have \(Z^BZ^b\) (blue), the probability of brown - feathered male offspring is \(0\).

Answer:

0% (corresponding to the option with 0%)