Question

To analyse the genotype of an organism, it is made to:

Options

• self cross

• cross with dominant parent

• cross with recessive parent

• cross with another species

Answer 1

cross with recessive parent

Explanation:

To analyze or determine the genotype of an organism showing a dominant phenotype, it is crossed with a recessive parent (one that is homozygous recessive for the trait). This kind of cross is called a test cross. If any offspring display the recessive phenotype, it indicates that the organism being tested is heterozygous; if all offspring show the dominant phenotype, the tested organism is homozygous dominant. This method helps to distinguish whether the dominant phenotype is due to a homozygous or heterozygous genotype.