white (w) is an X-linked gene that, in homozygous or hemizygous amorphs, results in the loss of all eye pigmentation in Drosophila melanogaster. Males are hemizygous and only have one copy of white. sepia (se) is an autosomal gene that, in homozygous amorphs, results in the loss of light red pigmentation so that the eyes are dark brown (the dark pigment is still produced). You cross a w-/w- female to a se-/se- male to produce F1s. What phenotype ratios do you expect among the F2s? (Hint, draw the male and female genotypes out first and keep track of X-linkage.) A. 6 wildtype, 8 w-, 2 se- OB. 8 wildtype, 6 w-, 2 se- O C. 8 wildtype, 2 w-, 6 se- O D. 6 wildtype, 2 w-, 8 se-

Human Anatomy & Physiology (11th Edition)
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white (w) is an X-linked gene that, in homozygous or hemizygous amorphs, results in the loss of all eye pigmentation in Drosophila melanogaster. Males are
hemizygous and only have one copy of white. sepia (se) is an autosomal gene that, in homozygous amorphs, results in the loss of light red pigmentation so that
the eyes are dark brown (the dark pigment is still produced). You cross a w-/w- female to a se-/se- male to produce F1s. What phenotype ratios do you expect
among the F2s? (Hint, draw the male and female genotypes out first and keep track of X-linkage.)
OA. 6 wildtype, 8 w-, 2 se-
B. 8 wildtype, 6 w-, 2 se-
C. 8 wildtype, 2 w-, 6 se-
D. 6 wildtype, 2 w-, 8 se-
Transcribed Image Text:white (w) is an X-linked gene that, in homozygous or hemizygous amorphs, results in the loss of all eye pigmentation in Drosophila melanogaster. Males are hemizygous and only have one copy of white. sepia (se) is an autosomal gene that, in homozygous amorphs, results in the loss of light red pigmentation so that the eyes are dark brown (the dark pigment is still produced). You cross a w-/w- female to a se-/se- male to produce F1s. What phenotype ratios do you expect among the F2s? (Hint, draw the male and female genotypes out first and keep track of X-linkage.) OA. 6 wildtype, 8 w-, 2 se- B. 8 wildtype, 6 w-, 2 se- C. 8 wildtype, 2 w-, 6 se- D. 6 wildtype, 2 w-, 8 se-
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