Hey guys, If anyone could help me out I would be grateful! I have no idea what the genotypes are for these. I thought maybe Z^bZ for the male, and Z^BW For the female... But that seems too easy.

Any help appreciated. Thank you!

 

In chickens, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). The mechanism for inheritance of the sex chromosomes is exactly the same as for X and Y sex chromosomes in other species. In chickens the character of 'barred' or striped feathers is Z-chromosome linked. The barred feather allele ZB is dominant to the non-barred feather allele Zb. Write down the genotype that would result in a non-barred male and a barred female and explain why these are the only genotypes that could result in these phenotypes.

Edited April 26, 201213 yr by milkbat

Hey guys, If anyone could help me out I would be grateful! I have no idea what the genotypes are for these. I thought maybe Z^bZ for the male, and Z^BW For the female... But that seems too easy.

Any help appreciated. Thank you!

 

In chickens, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). The mechanism for inheritance of the sex chromosomes is exactly the same as for X and Y sex chromosomes in other species. In chickens the character of 'barred' or striped feathers is Z-chromosome linked. The barred feather allele ZB is dominant to the non-barred feather allele Zb. Write down the genotype that would result in a non-barred male and a barred female and explain why these are the only genotypes that could result in these phenotypes.

 

As far as I see, your genotypes are partially correct. The only thing is that the second Z chromosome for the male chicken would also have to have a genotype for this allele. So the phenotype

 

 

The red Z^bZ^b is your non-barred male, and the Z^BW is your barred female. The reason this is the only genotype that works is because all the others would produce the wrong results.

Edited April 27, 201213 yr by The Flaming Goldfish