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sam01 sam01
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7 years ago
You are mapping three linked loci in Drosophila melanogaster (the common laboratory fruit fly). You cross flies that are triply mutant for apricot (pale eyes), bristle (extra bristles) and clipped (notched wings) to wild-type flies. The F1 flies are wild-type in appearance.

You then backcross the F1 females to pure-breeding (apricot, bristle, clipped) males and score the phenotypes of 1000 F2 progeny for all three loci. Here are the results:

359 wild-type
361 apricot, bristle, clipped
89 bristle, clipped
91 apricot
42 apricot, bristle
38 clipped
9 apricot, clipped
11 bristle

Using these data, first determine what gametes from the F1 trihybrid produced each of the eight F2 categories. Note that apricot = aa (recessive to wild-type A); bristle = bb (recessive to wild-type B); and clipped = cc (recessive to wild-type C).
Then determine if each gamete is recombinant (R) or nonrecombinant (NR) for each pair of alleles (that is, for each genetic interval).
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mandy3301mandy3301
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2 years ago
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F2 progeny Class

Gamete from trihybrid

A—B Recombinant or nonrecombinant?

A—C Recombinant or nonrecombinant?

B—C Recombinant or nonrecombinant?

359 wild-type

ABC

NR

NR

NR

361 apricot, bristle, clipped

abc

NR

NR

NR

42 apricot

aBC

R

R

NR

38 bristle, clipped

Abc

R

R

NR

91 apricot, bristle

abC

NR

NR

R

89 clipped

ABc

NR

NR

R

9 apricot, clipped

aBc

R

NR

R

11 bristle

AbC

R

NR

R

1

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