The barred plumage pattern in chickens is governed by a dominant sex-linked gene B (non-barred is the recessive phenotype and the recessive allele is designated b). A Barred female is crossed to a non- barred male. What types of offspring will be produced by this cross? Remember that females are the heterogametic sex in birds, so this gene is Z-linked. (a) Barred females and non-barred males (b) Non-barred females and barred males (c) 1:1 barred to non-barred for both sexes (d) 3:1 barred females and 1:1 nonbarred males (e) None of the above
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In birds, females are heterogametic (ZW) and males are homogametic (ZZ). Show more…
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Apply what you have learned about x-linked genes here: In chickens, it is the females that have two different sex chromosomes (ZW) while the males have two Z chromosomes (ZZ). A Z-linked gene controls the pattern of the feathers with the dominant B allele causing the barred pattern and the b allele causing non-barred feathers. From which of the following crosses would and half of the sons be barred and the other half be non-barred and half of the daughters be barred and the other half be non-barred? barred females/barred males non-barred females/barred males barred females/non-barred males non-barred females/non-barred males none of the choices are correct
Shaiju T.
The X-linked barred locus in chickens controls the pattern of the feathers, with the alleles $B$ for barred pattern and $b$ for no bars. If a barred female $\left(X^{B} Y\right)$ is mated to a nonbarred male $\left(X^{b} X^{b}\right)$, what will be the appearance of the male and female progeny? (Recall that in birds males are $\mathrm{XX}$ and females are XY.) Do you see any commercial usefulness for this result? (Hint: It is notoriously difficult to determine the sex of newly hatched chicks.)
Jiva Y.
Apply what you have learned about x-linked genes here: In chickens, it is the females that have two different sex chromosomes (ZW) while the males have two Z chromosomes (ZZ). A Z-linked gene controls the pattern of the feathers, with the dominant B allele causing the barred pattern and the b allele causing non-barred feathers. From which of the following crosses would all of the daughters be of one type (barred or non-barred) and all of the sons be of the other type? barred females/barred males barred females/non-barred males non-barred females/barred males more than one of the choices are correct non-barred females/non-barred males
Jennifer H.
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