QQuestion
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
✓Answer
(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.
Related Questions
More WBBSE Easy level questions
Only one type of gamete is produced from a pea plant having genotype YyRR
The wrinkled shape of seed is a ____ trait.
What is the difference between the two genes responsible for the expression of attached ear lobes and roller tongue?
The Guinea pig having the genotype BbRr is heterozygous for both the loci.
The cause of biodiversity on earth is ____ .
What are the dominant and recessive traits regarding the character related to the colour of flower of Pea plant? (a) Purple and Green (b) Purple and White (c) White and Purple (d) Purple and Yellow
What is a dominant trait?
What is hybridization?
If any pea plant contains either TT or tt trait, then the pea plant becomes heterozygous with respect to such alleles.
There is no role of female in determining sex of human.
The gene having the power of the rolling tongue is ____.
Decide which of the following two were selected by Mendel as dominant traits — (a) Length of stem - Long, Shape of seed — Round (b) Position of flower — Terminal, Colour of flower — White (c) Colour of the cotyledon — Green, Shape of seed — Wrinkled (d) Length of stem – Dwarf, Shape of seed — Wrinkled