Genetics animal

 

Genetics is the study of heredity, the means by which offspring inherit physical traits from their parents. Although most offspring produced by sexual reproduction resemble their parents, there is always some variation. Heredity is a complex process in which many different characteristics are transmitted to the offspring, of which only certain ones will show themselves in their physical appearance.

Single-factor inheritance can be seen in the inheritance of coat color in rats. When a black rat with the dominant genotype BB mates with a brown rat of the recessive genotype bb, the resulting offspring will all be genotype Bb and have black coats. But when rats of genotype Bb mate, three out of four of their offspring will have black coats, and only one will have a brown coat. Of the black rats, only one will be homozygous for a black coat (BB), as will the brown rat for its coat color (bb). The rest will be heterozygous (Bb).

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