You are examining 3 genes A, B, & D. You cross 2 true breeding lines in your par
ID: 62903 • Letter: Y
Question
You are examining 3 genes A, B, & D. You cross 2 true breeding lines in your parental generation to produce a heterozygous F1. You cross an F1 female to a test male to produce an F2 generation. The results of this cross are as follows:
Wild type 307
d 305
ab 311
abd 309
b 60
bd 65
a 69
ad 74
A) What was the genotype of the F1 female? B) Are all 3 genes linked? If any of these genes are linked, what is the map distance between them? C) What were the genotypes of the original “P” generation male & female?
Explanation / Answer
A. Genotype of F1 female is AaBbDd. This is test crossed with aabbdd.
yes, the genes are linked because parental types (wild type and abd) is much more in number.
distance between linked genes (in map units) = recombinants*100/total
note..... the results are not showing clearly which one are the recombinants.
c... The original P generation cross was AABBDD (female) X aabbdd (male)
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