n a two-point testcross of C/c.D/d with homozygous recessive “c/c.d/d”, we obser
ID: 218649 • Letter: N
Question
n a two-point testcross of C/c.D/d with homozygous recessive “c/c.d/d”, we observe the following frequencies for the genotypes of the gametic classes.
What are the genotypes of the recombinant classes?
(Your answer should consist of two gamete genotypes of two-characters each, separated by a comma and a space. Uppercase or lowercase does matter. Example of answer formatting only: "XX, xx", or "Xx, xX", etc.)
ANSWER: ___________________________________
What are the genotypes of the parental classes?
(Please use the same formatting as the previous answer.)
ANSWER: ___________________________________
What is the recombination frequency? (Your answer should be a decimal, rounded to the nearest hundredth. Example of answer formatting: "0.12".)
ANSWER: ___________________________________ %
cD CD cd Cd 128 35 25 112Explanation / Answer
genes do not assort independently . they are linked as shown in results because all the frequencies are different in number. recombinant genotypes - CD , cd and parental genotypes - Cd ,cD if the genes dont assort independently then parental combination should be most frequent.
recombination frequency =number of recombinant / total number of progeny *100
total number of progeny= 300
number of recombinant = 60
recombination frequency = 60/300 *100= 20 % that means 10cM distance between two genes
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