1. (7 pts). Tom, a wild, male turkey ( Meleagrisa gallopavo , 2N=80), had a very
ID: 69187 • Letter: 1
Question
1. (7 pts). Tom, a wild, male turkey (Meleagrisa gallopavo, 2N=80), had a very big night: he jumped the fence to the farm and successfully mated with the entire flock of female, domestic turkeys. Tom had big wattles (w+), dark feathers (d+) and green feet (g+). The females were true-breeding for small wattles (w), white feathers (d) and yellow feet (g). Alleles are in parentheses and the “+” indicates the dominant allele. The three loci are not part of a sex chromosome but they could be part of the same autosome. No interactions among the loci and 100 % penetrance. The result of Tom’s big night, many children, is summarized in the table:
Class #
Phenotypic Class of Children
Number of children
1
Big, dark, green
122
2
Big, dark, yellow
27
3
Big, white, green
33
4
Big, white, yellow
6
5
Small, dark, green
3
6
Small, dark, yellow
22
7
Small, white, green
28
8
Small, white, yellow
138
Total
???
____________________________________: What are the genotypes of the likely parental types of gametes produced by Tom, the male?
____________: What locus is in the middle on the genetic map for these loci?
c. ____ & _____: these “Class #s” are the reciprocal products when only a single crossover occurs and it occurs between the wattle locus and the feather locus in Tom.
d. ______: Calculate the recombination frequency between the wattle locus and the foot locus. Show your calculation here:
e. ______: Calculate the recombination frequency between the feather locus and the foot locus. Show your calculation here:
f. _____: What is the expected number of double crossovers? Show your calculation here:
g. ________: What is the estimate of interference for these data?
Class #
Phenotypic Class of Children
Number of children
1
Big, dark, green
122
2
Big, dark, yellow
27
3
Big, white, green
33
4
Big, white, yellow
6
5
Small, dark, green
3
6
Small, dark, yellow
22
7
Small, white, green
28
8
Small, white, yellow
138
Total
???
Explanation / Answer
a. Genotypes of the likely parental types of gametes produced by Tom, the male? w+wd+dg+g
b. Locus in the middle on the genetic map for these loci? Big dark (122+27) and small white (138+28) are close to each other. But not as close as Big green (122+33) and small yellow (138+22). In other words, I would say that green is closer to big than dark. So, green will be in middle. And the gene order would be big---green---dark.
c. Big white yellow & small dark green: these “Class #s” are the reciprocal products when only a single crossover occurs and it occurs between the wattle locus and the feather locus in Tom.
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