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timothytomas2046
12.09.2019 •
Biology
Imagine you have two pure-breeding lines of canaries, one with yellow feathers and the other with brown feathers. in crosses between these two strains, yellow female x brown male gives only brown sons and daughters, while brown female x yellow male gives only brown sons and yellow daughters. propose a hypothesis to explain these results.
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Ответ:
The results can be explained if the gene that determines color of feathers is located in the Z chromosome.
Explanation:
Unlike mammals that have X and Y sex chromosomes, birds have Z and W sex chromosomes. Females are ZW and males are ZZ.
The gene that determines color of feathers has the alleles:
B_ = brown color
bb = yellow color.
1st crossyellow female x brown male
♀️Gametes
Female:
, ![W](/tpl/images/0229/0971/b6ef1.png)
Male:![Z^B](/tpl/images/0229/0971/a8bc4.png)
F1brown female x yellow male
♀️Gametes
Female:
, ![W](/tpl/images/0229/0971/b6ef1.png)
Male:![Z^b](/tpl/images/0229/0971/a1257.png)
F1Ответ:
D. Condensation
Explanation: