What is the ratio of the number of genotypes BBRr and BBRR produced in the F2 generation of dihybrid cross in Guinea pig?
(a) 2 : 1
(b) 4 : 1
(c) 1 : 2
(d) 1 : 1
WBBSE
Class X
Life Science
03 (a) Heredity
01 Mark
2023
(d) 1 : 1
Explanation
In a dihybrid cross involving two genes (B and R), the F1 offspring genotype is heterozygous (BbRr). When these are self-crossed, the phenotypic and genotypic ratios in F2 can be predicted using a Punnett square. Specifically, the ratio of genotypes BBRr to BBRR follows a 1:1 ratio due to independent assortment and segregation of alleles during gamete formation. This means both genotypes appear in equal frequency in the F2 generation.
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