Study the pedigree chart given below:

What does it show?

1.	Inheritance of a sex-linked inborn error of metabolism
2.	Inheritance of a condition like phenylketonuria as an autosomal recessive trait
3.	The pedigree chart is wrong as this is not possible
4.	Inheritance of a recessive sex-linked disease like haemophilia

Select the incorrect statement from the following:

A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

1. AaBb

2. AaBB

3. AABb

4. AABB

In hexaploid wheat, the haploid (n) ar basic (x) numbers of chromosomes are:

1. n=7 and x=21

2. n=21 and x=21

3. n=21 and x=14

4. n=21 and x=7

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 the most suitable, medium for culture of Drosophila melanogaster?

1. Moist bread

2. Agar agar

3. Ripe banana

4. Cow dung