Question

If a diploid organism possesses one dominant allele and one recessive allele for a particular gene, then ________ of its gametes will possess the dominant allele and ________ of its gametes will possess the recessive allele.
A. all, none
B. half, half
C. none, all
D. 75%, 25%
E. Not enough information is given

Answer 1

Answer:

B. half, half

Explanation:

When a diploid organism has one dominant allele and one recessive allele of a gene, it is said to be heterozygous for the gene. During gamete formation, random segregation of homologous chromosomes leads to separation and random distribution of alleles of a gene in separate gametes. Therefore, a heterozygous individual for a gene forms two types of gametes: 50% of the gametes with dominant allele and rest 50% with the recessive allele.

For instance, an individual with an "Aa" genotype will form 50% gametes with an "A" allele and 50% gametes with an "a" allele.