Drosophila melanogaster has one pair of sex chromosomes (XX or XY) and three pai
ID: 322918 • Letter: D
Question
Drosophila melanogaster has one pair of sex chromosomes (XX or XY) and three pairs of autosomes, referred to as chromosomes II, III, and IV. A genetics student discovered a male fly with very short (sh) legs. Using this male, the student was able to establish a pure breeding stock of this mutant and found that it was recessive. She then incorporated the mutant into a stock containing the recessive gene black (b, body color located on chromosome II) and the recessive gene pink (p, eye color located on chromosome III). A female from the homozygous black, pink, short stock was then mated to a wild-type male. The F1 males of this cross were all wild type and were then backcrossed to the homozygous b, p, sh females. The F2 results appeared as shown in the following table. No other phenotypes were observed.
Based on these results, the student was able to assign short to a linkage group (a chromosome). Which one was it?
a. X chromosome
b. chromosome II
c. chromosome III
d. chromosome IV
Explanation / Answer
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Category females males wild 63 59 122 pink 58 65 123 black short 55 51 106 black pink short 69 60 129Related Questions
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