Question

Choose the correct option-

Alleles are-

• A. heterozygotes
• B. different forms of a gene
• C. true-breeding homozygotes
• D. different phenotype

Answer 1

The correct option is B

different forms of a gene

The correct option is B.

Explanation of correct option

1. Alleles are different variants of a particular gene.
2. Various traits like height, eye, skin color, the structure of hemoglobin, blood type, etc., are governed by the inheritance of different alleles.
3. Each individual diploid consists of a pair of alleles.
4. If both alleles are different and one allele is expressed, it is called dominant, and the other allele which remains masked is called recessive.
5. If the alleles carried are identical, it is called homozygous, and if they are non-identical, it is called heterozygous.
6. Phenotypes refer to the physical properties that can be observed in an organism.
7. Examples- The pea plant produces flowers of two different kinds- purple and white.
8. This is due to the action of the dominant allele (purple color)- B and recessive allele (white color)- b.

Final answer: Alleles are different forms of a gene.