Let the "barred" allele be caller B and the "non-white" allele b. Since chickens use chromosomes $Z$ and $W$ to determine sex, hens would have chromosomes $ZW$ , and roosters would have chromosomes $ZZ$ . A Z-linked gene is represented as a superscript on the $Z$ chromosome, $Z^{B}$ for the dominant allele and $Z^{b}$ for the ressesive allele.

A barred hen would have a copy of B on its Z chromosome, a non-barred rooster would have both copies of b on both Z chromosomes. Using Punnet squares to represent the crosses we get the following cases:

$\begin{center}\begin{tabular}{ |c|c|c|c| }\ & Z^{B} & W \\ \ Z^{b} & Z^{B}Z^{b} & Z^{b}W \\ \ Z^{b} & Z^{B}Z^{b} & Z^{b}W \\ \end{tabular}\end{center}$

That is a ratio of two barred heterozygote roosters to two non-barred hens. Crossing them we get:

$\begin{center}\begin{tabular}{ |c|c|c|c| }\ & Z^{b} & W \\ \ Z^{B} & Z^{B}Z^{b} & Z^{B}W \\ \ Z^{b} & Z^{b}Z^{b} & Z^{b}W \\ \end{tabular}\end{center}$

That is a ratio of one barred heterozygote rooster to one barred hen to one non-barred rooster to one non barred hen.

6 0

3 years ago

When the linnaean system of classification was first develop in the early 1700s, it had 3 kingdoms by the mid-1900s , it had fiv

Svetradugi [14.3K]

<span>New kingdoms were needed that reflected our growing knowledge of the differences between living organisms.

The classification system requires criteria to differ the organism. As the technology and research advance, we can observe more characteristic of many organisms and found more differences between them.</span>

6 0

2 years ago

To recharge your cell phone you plug it into an electrical outlet for several hours. The electrical energy is stored as ____ ene

SashulF [63]

I’m pretty sure it would be electrical, but since is not an answer the the best would probably be chemical, since heat isn’t able to charge a phone, you’re not using nuclear decay to charge a phone, and the charging cord is not radiating power to your phone

3 0

3 years ago