Consider the following statement and find out the incorrect one:

(1) Advancement in Microscopy made the study of chromosomal behaviour possible.

(2) The two alleles of a gene pair are located on homologous site on homologous chromosomes.

(3) Experimental verification of chromosomal theory of Inheritance was done by T. H. Morgan et. Al.

(4) Morgan Chose Drosophila as an experimental animal because it has variations that can be seen with high power of microscope.

Linkage was described by Morgan in Drosophila. Which of the following combinations are correct?

(i) He hybridised yellow bodied, white-eyed females to brown-bodied, red eyed males and then intercrossed their F₁

(ii) The ratio of F₂ generation is same as that of 9:3:3:1 in this cross.

(iii) The parental combinations are observed more than recombinants.

(iv) According to Morgan Linkage was observed due to chemical association of genes.

(v) All the genes present on same chromosomes have same efficiency to link.

(1) (ii), (iv), (v)

(2) (i), (iii)

(3) (i), (iii), (v)

(4) (i) and (iv)

Two heterozygous round yellow seeded pea plants are intercrossed. In the progeny, the trait for seed shape will segregate in the ratio:

1.1 : 1

2.3 : 1

3.1 : 1 : 1 : 1

4.9 : 3 : 3 : 1

The mapping of genes on chromosome was attempted by

(1) T. H. Morgan

(2) Walter Sutton

(3) Alfred Sturtevant

(4) Henking

Today ________ are extensively used as a _______ point in the sequencing of whole genome

(1) Pedigree charts, conclusive

(2) Genetic maps, starting

(3) Pedigree charts, starting

(4) Genetic maps, conclusive

The initial studies for sex determination were done over

(1) Plants

(2) Insects

(3) Humans

(4) Hen

The concept of X body was given by

(1) T. H. Morgan

(2) Walter Sutton

(3) Alfred Sturtevant

(4) Henking

Which of the following statements are correct regarding Chromosomal basis of sex determination?

(i) The mechanism of sex determination in insects is of XO type.

(ii) XX insect is female while XO insect is male.

(iii) The X chromosome is called sex chromosome because it was involved in sex determination.

(iv) Grasshopper has XY type of sex determination.

(v) Man has XX type of sex determination.

(1) (iv), (v)

(2) (i), (ii), (iii), (iv), (v)

(3) (i), (ii), (iii)

(4) (i), (iv), (v)

Among human males _______ chromosome is present but its counterpart is _____ and called ______ chromosome.

(1) Y, bigger, Z

(2) X, smaller, Z

(3) X, smaller, Y

(4) Z, bigger, X

In which of the following male heterogamety is not observed?

(1) Insects

(2) Birds

(3) Humans

(4) (1) and (2)