How is traids get expressed from parents to off spring ? Explain with an example .
Answers
Hi,
The gene which decides the appearance of an organism even in the presence of an alternative gene is known as a dominant gene. The trait expressed is known as a dominant trait.
The dominant gene is represented by a capital letter.
The gene which decides the appearance of an organism only in the presence of another identical gene is called a recessive gene. The trait expressed is known as a recessive trait.
The recessive gene is represented by a small letter.
For example, Pure tall (TT) pea plant was crossed with dwarf (tt) plant.
Phenotypic Ratio: 3:1
Genotypic Ratio: 1:2:1
F1 Generation: All plants obtained were heterozygous tall (Tt). Plants from F1 generation were self-pollinated to obtain F2 generation.
F2 Generation: One homozygous tall plant (TT), two heterozygous tall plants (Tt) and one homozygous dwarf plant (tt) were obtained.