Question

Choose the correct answer from each of the four options given below:

The recessive gene is one which expresses itself in.

• A. Heterozygous condition
• B. Homozygous condition
• C. F₂ generation
• D. Y-linked inheritance

Answer 1

The correct option is B

Homozygous condition

The correct option is B.

Explanation of the correct option:

1. A gene is present in two or more allelic forms out of which one is dominant and the other is recessive.
2. The recessive allele hides itself and does not express its character in the presence of dominant allele.
3. White colour of the snapdragon flower is an example of recessive gene.
4. In homozygous condition there are two similar alleles of a gene.
5. So the recessive gene can be expressed only in homozygous conditions.

Explanation of the incorrect options:

Option A:

1. In heterozygous condition, there are two different alleles e.g. dominant and recessive alleles.
2. As per the law of Mendel regarding inheritance, the presence of a dominant allele hides the expression of the recessive allele.
3. So, recessive allele can never be expressed in heterozygous condition.

Option C:

1. F₂ generation is the generation that develops as a result of inbreeding among individuals of the F₁ generation.

Option D:

1. Y-linked inheritance describes traits that are produced by genes located on the Y chromosome.

The recessive gene is one that expresses itself in homozygous condition.