Question

What is a 'gene? Explain the meaning of dominant genes and recessive genes with examples​

Answer 1

A gene is the funtional unit of DNA.

Alleles are the alternate forms of a gene.

Two types of genes:

Dominant: Alleles which can be expressed in both homologous and homozygous condition.

e.g., Tallness

Recessive: Alleles which can be expressed only in homologous chromosomes.

e.g., Dwarfness

Answer 2

Answer:

Gene is a unit of DNA on a chromosome which governs the synthesis of one protein that controls a specific characteristics of an organism.

Gene is also known as Allele.

Two types of gene are:

1. Dominant Genes: The gene which decides the appearance of an organism even in the presence of an alternative gene.

• Ex- TT , where T shows tallness

2. Recessive Genes: The gene which can decide the appearance of an organism only in the presence of another identical gene.

• Ex- Tt , where t shows dwarfness

Here, T is dominant character and t is recessive character.

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