In a fruit fly, the body color is affected by an X-linked gene with two alleles,
ID: 98788 • Letter: I
Question
In a fruit fly, the body color is affected by an X-linked gene with two alleles, y for yellow body and y+ for the wild type brown body color. Yellow body is recessive to wild type. Wing morphology is affect by an autosomally inherited gene with two alles, b for ben wing and b+ for wild type straight wing. Bent is recessive to straight. Females from a true-breeding strain with wild type body and wild type wings are crossed with males from a true-breeding strain with yellow bodies and bent wings. If the F1 males and females mate what will the phenotypes in the males and females of the F2 generation be?And in what portions are they expected
Explanation / Answer
Answer:
Female: brown body, Straight wing (6/8) ; brown body, entb wing (2/8)
Male: brown body, Straight wing (3/8) : yellow body, Straight wing (3/8) : yellow body, Straight wing (1/8) : yellow body, Bent wing (1/8)
Explanation:
Females from a true-breeding strain with wild type body and wild type wings= Xy+b+ Xy+b+
Males from a true-breeding strain with yellow bodies and bent wings= Xyb Y
Xy+ Xy+; b+ b+ (female) x (Male) XyY; bb ----------Parents
Xy ; b
Y; b
Xy+; b+
Xy+ Xy; b+b (female- brown body, straight wing)
Xy+ Y; b+b (male-brown body, straight wing)
(F1xF1):
Xy+ Xy; b+b (female- brown body, straight wing) x Xy+ Y; b+b (male-brown body, straight wing)
Xy+ ; b+
Xy+ ; b
Y; b+
Y; b
Xy+ ; b+
Xy+Xy+ ; b+b+ (brown body, Straight wing)
Xy+Xy+ ; b+b (brown body, Straight wing)
Xy+Y ; b+b+ (brown body, Straight wing)
Xy+Y ; b+b (brown body, Straight wing)
Xy+ ; b
Xy+Xy+ ; b+b
(brown body, Straight wing)
Xy+Xy+ ; bb
(brown body, Bent wing)
Xy+Y ; b+b (brown body, Straight wing)
Xy+Y ; bb (brown body, Bent wing)
Xy ; b+
Xy+Xy ; b+b+ (brown body, Straight wing)
Xy+Xy ; b+b (brown body, straight wing)
XyY ; b+b+ (yellow body, Straight wing)
XyY ; b+b (yellow body, Straight wing)
Xy ; b
Xy+Xy ; b+b
(brown body, Straight wing)
Xy+Xy ; bb (brown body, Bent wing)
XyY ; b+b (yellow body, Straight wing)
XyY ; bb (yellow body, Bent wing)
Female
Male
Xy ; b
Y; b
Xy+; b+
Xy+ Xy; b+b (female- brown body, straight wing)
Xy+ Y; b+b (male-brown body, straight wing)
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.