Sickle cell anaemia is:

1.	an autosomal linked dominant trait
2.	caused by substitution of valine by glutamic acid in the globin chain of haemoglobin
3.	caused by a change in base pair of DNA
4.	characterized by elongated sickle like RBCs with a nucleus

Point mutation involves:

1. insertion

2. change in single base pair

3. duplication 

4. deletion

Study the pedigree chart given below:

What does it show?

Inheritance of skin colour in humans is an example of:

1. chromosomal aberration

2. point mutation

3. polygenic inheritance

4. codominance

Two genes R and Y are located very close on the chromosomal linkage map of the maize plant. When RRYY and rryy genotypes are hybridized, then F₂ segregation will show:

1. higher number of the recombinant types

2. segregation in the expected 9:3:3:1 ratio

3. segregation in a 3:1 ratio

4. higher number of the parental types

A common test to find the genotype of a hybrid is by:

1. crossing of one F₂ progeny with a male parent

2. crossing of one F₂ progeny with a female parent

3. studying the sexual behaviour of F₁ progenies

4. crossing of one F₁ progeny with a male parent

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow-seeded plant is crossed with a green-seeded plant, what ratio of yellow and green-seeded plants would you expect in F1generation?

1. 50:50

2. 9:1

3. 1:3

4. 3:1

Which one of the following is an example of polygenic inheritance?

1. Flower colour in Mirabilis jalapa

2. Production of male honey bee

3. Pod shape in garden pea

4. Skin colour in humans

In Mendel's experiments with garden peas, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F₂ generation of the cross RRYY x rryy?