Two pairs (A and B) of rabbits were crossed as given below:

(a) Can you tell which coat colour (black or white) is dominant?

(b) Is the coat colour sex-linked?

Make a Punnett square and find out the genotypic and phenotypic ratios of F₁ and F₂ generations in the progeny of a genetic cross between:

(a) A pure tall (TT) pea plant with a pure dwarf (tt) pea plant.

(b) Red flower variety of pea (RR) with white flower variety of pea (rr).

Mendel crossed a homozygous pea plant having round seeds (RR) with a homozygous pea plant having wrinkled seeds (rr). He got different results. On the basis of it, answer the following questions:

(a) Which character of seed is studied in the experiment?

(b) Which of the above two traits is dominant ?

(c) Write the phenotype and genotype of F₁ offspring.

(d) Mention and state the Mendel’s law shown in the above cross.

(e) Make a Punnett square for F₂ generation when two plants of F₁ offspring are crossed with each other.

(f) Write the phenotypic ratio of F₂ progeny.

(g) What will be the genotypic ratio of F₂ offsprings ?

(h) What are the two traits of seed colour ? Also mention which is dominant and recessive ?

(i) Write the scientific name of garden pea.

(j) Write two main features of pea plant due to which Mendel had selected it for his hybridisation studies.

A homozygous plant having round (R) and yellow (Y) seed is crossed with another homozygous plant having wrinkled (r) and green (y) seeds. Answer the following questions :

(a) Give the genotype of the F₁ generation.

(b) Mention the phenotype of the F₁ offsprings.

(c) Give the possible combinations of gametes that can be obtained from F₁ hybrids.

(d) Give the dihybrid phenotypic ratio and the phenotype of the offsprings of the F₂ generation when two plants of F₁ generation are crossed.

(e) Name and state the law which explains the dihybrid phenotypic ratio.