What do you understand about the independent inheritance of traits?

Give reasons, why the hybrids are generally found to be superior to their parents.

(i) A gene can express more than one trait. What gives rise to different expressions?

(ii) When a true breeding pea plant which has yellow seeds is pollinated by a plant that has green seeds, all the F 1 plants have yellow seeds. What might have been the allele for yellow seeds (tell whether it was dominant or recessive / heterozygous or homozygous )?

An animal (guinea pig) having black colour is crossed with guinea pig having the same colour. They produced 100 offsprings, of which 75 were black and 25 were white.

Find out

(i) What is the possible genotype?

(ii) Which trait is dominant and which is recessive?

A cross was made between pure-breeding pea plants one with round and green seeds and the other with wrinkled and yellow seeds.

(i) Write the phenotype of F 1 progeny. Give a reason for your answer.

(ii) Write the different types of F 2 progeny obtained along with their ratio when F 1 progeny was selfed.