JJ KK and jj kk individuals (parents) were crossed to each other, and the F1 were...

JJ KK and jj kk individuals (parents) were crossed to each other, and the F1 were testcrossed to the jj kk parent strain. The resulting offspring were: 999 Jj Kk : 999 jj kk : 1 Jj kk : 1 jj Kk. How would the testcross progeny ratios differ if the parents were JJ kk and jj KK instead?

Multiple Choice

>9 Jj Kk : >1 jj kk : <3 Jj kk : <3 jj Kk
1 Jj Kk : 1 jj kk : 999 Jj kk : 999 jj Kk
They would not change.
1 Jj Kk : 1 jj kk : 1 Jj kk : 1 jj Kk
9 Jj Kk : 3 jj kk : 3 Jj kk : 1 jj Kk
<9 Jj Kk : <1 jj kk : >3 Jj kk : >3 jj Kk

Solutions

Expert Solution

The answer is 1 Jj Kk : 1 jj kk : 999 Jj kk : 999 jj Kk

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Irrespective of the genes arrangement (it may be either cis or trans configuration), the recombination pertage is constant.

The parental genotypes i.e. JJ KK and jj kk indicates that the F1 is in cis configuration for theese genes J and K. so, the genotype of the F1 is JK // jk. While testcrossing parental combinations segreagtes in high frequency so, JK//jk and jk//jk are high and recombinants segregates low in frequencyes so Jk//jk and jK//jk appear low in frequency.

The high frequency categories with 999 frequecy indiacates the parentl categories and low frequency categories with 1 frequency indicates recombinant categories.

But, in JJ kk and jj KK case, the F1 will be in Trans configuration... find the below image for answer and explanation...

gladiator answered 1 year ago

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