Suppose the following genotypes are in a 1:1:1:1 ratio. TTDD, TtDD, ttDD, TdDd If there are...

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Biology

Suppose the following genotypes are in a 1:1:1:1 ratio. TTDD,TtDD, ttDD, TdDd If there are a total of 160 individuals, how manyof them have the genotype TdDD?

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4.4 Ratings (807 Votes)

The ratio given in the question is the ratio of dihybrid test cross.

A test cross is a type of backcross in which the individual is specifically crossed to a recessive parent. In phenotypic ratio in dihybrid, test cross is 1:1:1:1. Test cross is used to identify the heterozygosity of an individual

Four genotypesÂ Â Â Â Â Â Â Â Â Â =Â Â Â Â Â Â Â Â Â TTDD, TtDD, ttDD, TdDd

Total individuals are =Â Â Â Â Â Â Â Â Â 160

No of individuals with TTDD genotypeÂ Â Â Â Â Â =Â Â Â Â Â Â Â Â Â ?

All four genotypes are in 1:1:1:1 ratio so = 1/4*160

= 40

The No of individuals with TTDD genotype is 40.

Other genotypes having individuals are

TtDDÂ Â =1/4*160Â Â Â Â Â Â Â Â =Â Â Â Â Â Â Â Â Â 40

ttDD =1/4*160Â Â Â Â Â Â Â Â Â =Â Â Â Â Â Â Â Â Â 40

TdDd= 1/4*160Â Â Â Â Â Â Â Â =Â Â Â Â Â Â Â Â Â 40

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