Q. 165.0( 1 Vote )

Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
A. 1 : 1 : 1: 1

B. 9 : 3 : 3 : 1

C. 3 : 1

D. 1 : 1

Class 12th Biology - Exemplar 5. Principle of Inheritance and Variation

Answer :

genotype of the offspring of next generation is AaBb:Aabb:aaBb:aabb which means the ratio is 1:1:1:1.

According to the dihybrid cross between heterozygous gene AaBb and homozygous gene aabb; the ratio is 1:1 in terms of phenotype. (It is 4:4:4:4 that is 1:1:1:1 for the genotype).

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PREVIOUSIt is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the NEXTIn the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are:

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Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation? A. 1 : 1 : 1: 1B. 9 : 3 : 3 : 1C. 3 : 1D. 1 : 1

Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
A. 1 : 1 : 1: 1

B. 9 : 3 : 3 : 1

C. 3 : 1

D. 1 : 1