1) A particularly nasty species of Asian termite has invaded North America and t
ID: 214624 • Letter: 1
Question
1) A particularly nasty species of Asian termite has invaded North America and threatens to destroy all our wood telephone poles. Your job is to map its genome. There are two genes that are of particular interest. They are the gene for mandible size and the gene for appetite. These two genes are on the same chromosome (they are linked). Each gene has two alleles. For the mandible size gene, there is the dominant big mandible allele (T) and the recessive small mandible allele (t). For the appetite gene, there is the dominant huge appetite allele (A) and the recessive petite appetite allele (a). You cross two true breeding individuals, a female with big mandibles and a huge appetite with a male that has small mandibles and a petite appetite to produce offspring that are all heterozygous for both traits. You then do a test cross of one of these individuals that is heterozygous for both traits. The results of the test cross are as follows: 8,120 with big mandibles and a huge appetite; 8,620 with small mandibles and a petite appetite; 876 with big mandibles and a petite appetite; 984 with small mandible and a huge appetite. Based on these data NEATLY AND CLEARLY A) calculate the recombinant frequency; B) make sure you show all your work with all items clearly labeled; C) construct a gene map that is clearly labeled; D) include an explanation of what the gene map is showingExplanation / Answer
Total offspring = 18600
recombinants = 876 + 984 = 1860
Recombinant frequency 1860 / 18600 x 100 = 10%
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