A homozygous tall pea plant is crossed with its homozygous recessive parent. Find out the genotypic and phenotypic ratio with the help of Punnet square method.

A homozygous tall pea (TT) plant is crossed with its homozygous recessive (tt) parent. All the offspring produced in the F1 generation will be tall pea (Tt) plants and heterozygous. They produce offspring as shown in the given Punnet square: Female gametes Male gametes T T t Tt (Tall) Tt (Tall) t Tt (Tall) Tt (Tall) Therefore, in the F1 generation, the phenotypic ratio- all tall The genotypic ratio- all heterozygous (Tt).

Complete the following chart and rewrite it: Genotype Phenotype I A I A or I A i _____ _____ B I A I B _____ _____ O

Genotype Phenotype I A I A or I A i A I B I B or I B i B I A I B AB ii O Human blood type is determined by codominant alleles. There are three different alleles, known as I A , I B , and i. The I A and I B alleles are codominant, and the i allele is recessive. The possible human phenotypes for the blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous (I A I A or I B I B , respectively), or heterozygous (I A i or I B i, respectively).

Define ‘linkage’.

Two or more genes that are linked together are always inherited together in the same combination for more than two generations. Linkage describes the way in which two genes that are located close to each other on a chromosome are often inherited together.