SEX LIMITED TRAITS
16. SEX LIMITED TRAITS
When the characters are physically expressed in one sex only. That is known as a sex-limited trait. But the gene is present in both the sexes. In the presence of hormones, sex-limited genes are activated. These are autosomal traits. In the presence of androgens (male hormones), the beard controlling gene is activated. That mean the secondary sexual characters like beard presence in male human beings and absence in female human beings is due to the absence of androgen hormones.
As we know, the milk secretion genes are present in male and female, both the sexes. But only milk is secreted from female mammals. And the egg-laying genes are present in both (males and females) the sexes of birds but the egg is laying by only female birds.
The sex-limited trait is autosomal, that means genes are not present on the X or Y chromosomes. That is expressed in only one sex. The characters limited to only one sex (gender) due to hormone differences or anatomical difference is known as the sex-limited trait.
- MENDEL'S LAW OF GENETICS
- REPRESENTATION OF MENDEL’S EXPERIMENTS
- FORKED-LINE METHOD
- TRIHYBRID CROSS
- EXTENSIONS AND MODIFICATIONS OF BASIC PRINCIPLES OF MENDEL LAW
- TEST CROSS AND THE BACKCROSS
- CHROMOSOMAL BASIS OF INHERITANCE
- EXTENSION OF MENDELIAN GENETICS
- LINKAGE MAPPING
- TETRAD ANALYSIS
- BACTERIAL GENETICS
- PEDIGREE ANALYSIS
- SEX INFLUENCE TRAIT
- SEX LIMITED TRAITS
- POLYGENIC INHERITANCE-MULTIPLE GENE INHERITANCE QUANTITATIVE INHERITANCE
- CHROMOSOMAL ABBERATIONS