Question

How do you represent dominant and recessive genes?

Answer 1

Dominant gene:

• The dominant form of a gene, or a dominant allele is an allele that expresses itself irrespective of the presence of another allele.

Representation of dominant gene:

• A dominant gene is represented by a capital letter.
• In an individual with genotype Tt, a capital letter or T will be the dominant allele.
• A pair of alleles that can control the height of an organism. Here, the allele represented with T is dominant.

Recessive gene:

• A recessive form of a gene, or a recessive allele is an allele whose ability is suppressed by the dominant allele.
• The expression of recessive alleles can only occur when two recessive alleles coding for the same trait are present together.

Representation of recessive gene:

• A recessive gene is represented by a small letter.
• In an individual with genotype Tt, a pair of alleles control the height of an organism.
• Here, the allele represented with a small letter or t will be the recessive allele and its ability will be suppressed in the organism.
• It can only show its ability when it forms a genotype along with another t allele.