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What Determines Sex?
Newly hatched chicks need to be sexed by farmers; in the Plymouth rock breed of chickens
there is a dominant sex-linked allele, B, which causes the normally black feathers to have
a white bar. Newly hatched chicks with the allele B have barred feathers, seen as a…

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Male Gametes

Female Gametes XB XB

Xb XBXb ­ Male//White Spot XBXb ­ Male//White Spot

Y XBY ­ Female//White Spot XBY ­ Female//White Spot

Pale Brindled Moths
There is a rare black form of the pale brindled moth; they are all female and when such
a female mates with a…

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Cross female (XbY) and male (XBXb)

o G1 = |XBXb ­ Male//Black|,|XbXb ­ Male//Brown|

|XBY ­ Female//Black|,|XbY ­ Female//Cinnamon|

Cross female (XbY) and male (XbXb) ­ (G1)

o G2 = |XbXb ­ Male//Brown|,|XbXb ­ Male//Brown|

|XbY ­ Female//Cinnamon|,|XbY ­ Female//Cinnamon|


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