The genotype of an individual refers to the sum total of the genes inherited from both the parents irrespective of whether they are expressed or not. E.g TT, Tt and tt are the different genotypes for the height of a pea plant in pure tall, hybrid tall and dwarf variety.

A test cross is a method to test the genotype of hybrids obtained in a cross. In a test cross, the individual offspring of the F 1 generation is crossed with the homozygous recessive parent. Since the offspring is crossed back with one of the parents, it is also called back cross.

What do letter F 1 And F 2 Represent in heredity studies?

F 1 Term means the first filial generation, and it shows hybrids generated from a cross among the genetically distinct people called parents. F 2 Represents the second filial generation, and it arises as a result of inbreeding of interbreeding between the individuals of F 1 Generation. F 1 generation and F 2 generation are the used in the genetics which is a branch of biology.

Given below is a table showing the genotypes of blood groups in the human population. S.no Genotype Phenotype 1. I A I O A-Phenotype for Y 2. I B I O B-Phenotype for Z 3. I A I B AB 4. X O Name the pattern of inheritance exhibited by the phenotypes Y and Z in the table.

See the answer table given below S.no Genotype Phenotype 1. I A I O A (Y) 2. I B I O B (Z) 3. I A I B AB 4. ii O Y: The allele I A is dominant over i and hence, the phenotype is A group. So it follows law of dominance. Z: The alleles I B is dominant over I O hence the phenotype is B. It also follows the same patterns of inheritance.

What is the cross between the F 1 progeny and the homozygous recessive parent called?

F 1 is also known as the first filial progeny. It always resembles either of the parents and that the trait of other parent was not seen in them. The cross between the F 1 progeny and the homozygous recessive parent is called the Test cross.