A. A plant of genotype CCdd is crossed to ccDD. An F1 of that cross is...

A. A plant of genotype CCdd is crossed to ccDD. An F1 of that cross is testcrossed to ccdd. If the genes are unlinked, the percentage of C_D_ progeny of that cross will be _____%

B. A plant of genotype CCdd is crossed to ccDD. An F1 of that cross is testcrossed to ccdd. If the genes are so tightly linked that no recombination occurs between them, the percentage of C_D_ progeny of that cross will be _____%

Expert Solution

Case I: When the genes are unlinked (they will follow mendels law of inheritance and will produce recombinant type other than parental types)

A test cross between CcDd (F1 ) and ccdd (double recessive parent) will produce a ratio of 1:1:1:1 as shown in the image below. Hence the percentage of Progeny C_D_ of this cross will be 25 %.

Case II: When genes are completely linked (there will be no crossing over between the genes and therefore only parental type will be formed and no recombinant type will appear.)

A test cross between CcDd (F1) and ccdd will produce a ratio of 1:1 and the progenies with C_D_ genotype will be 50 %.

Please see image

gladiator answered 1 year ago

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