In a monohybrid cross, what will be a percentage of heterozygous offspring in F3-generation?

Question

In a monohybrid cross, what will be a percentage of heterozygous offspring in F3-generation? (A) 25 % (B) 50 % (C) 12.5 % (D) 62.5 %

Tardigrade Admin · Accepted Answer

A monohybrid cross has the genotypes completely dominant or completely recessive alleles (RR or rr). When these two genotypes are crossed,(RR x rr), the F1 generation will have all heterozygous plants (RrRr). In F2 generation when RrRr is crossed, Rr, RR and rr plants are formed in 2:1:1 ratio. In F3 generation when the cross was done between the plants with genotypes RR X Rr, Rr X Rr, Rr X rr, RR X rr, we will get RR, rr and Rr plants in 3:3:10 ratio. The total number of heterozygous gametes are 10; hence, the percentage of heterozygous offspring will be 10/16*100= 62.5%.

Q. In a monohybrid cross, what will be a percentage of heterozygous offspring in F₃-generation?

$25%$

$50%$

$12.5%$

$62.5%$

Q. In a monohybrid cross, what will be a percentage of heterozygous offspring in F3-generation?

25%

50%

12.5%

62.5%

Q. In a monohybrid cross, what will be a percentage of heterozygous offspring in F₃-generation?

$25%$

$50%$

$12.5%$

$62.5%$