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The coupling and repulsion theory of Bat...

The coupling and repulsion theory of Bateson and Punnett later on modified linkage and crossing over by Morgan. Two completely linked genes show a dihybrid ratio of

A

`1:1`

B

`3:1`

C

`1:1:1:1`

D

`9:3:3:1`

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The correct Answer is:
B
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A dihybrid test cross ratio for two linked genes in a hybrid is

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"F"_(2) generation in Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1 . It represents a case of: 1. Dihybrid cross 2. Monohybrid cross with complete dominance 3. Monohybrid cross with incomplete dominance 4. Co-dominance

Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized the F_(2) segregation will show 1. segregation in the expected 9:3:3:1 ratio 2. segregation in 3:1 ratio 3. higher number of parental types 4. higher number of the recombinant types

Depending upon the distance between any two genes which is inversely proportional to the strength of linkage cross overs will vary form.

Two genes 'A' and 'B' are linked. In a dihybrid cross involving these two genes, the F_(1) hetrozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?

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