principles of inheritance & variation- Quiz 3

A tall red-flowered pea plant after crossing with a dwarf white-flowered plant yields only tall red-flowered plants. A test cross shall give a ratio of

• 1 : 1

• 3 : 1

• 1 : 2 : 4 : 6 : 4 : 2 : 1

• 1 : 1 : 1 : 1

Mendel did not propose the theory of –

• dominance

• incomplete dominance

• segregation

• independent assortment

Pleiotropic gene has –

• single genotype

• multiple genotype

• multiple phenotype

• single phenotype

A blue fowl obtained from mating between black and white fowls, is self-crossed. The F2 ratio is

• 1 black : 2 white : 1 blue

• 1 black : 2 blue : 1 white

• 2 black : 1 white : 1 blue

• none of these

A child with mother of A group and father of AB group, will not have the following blood group –

• A

• B

• AB

• O

Linkage was discovered by

• Mendel

• Morgan

• Crick

• Muller

What will be the number of linkage groups in a cell having 2n = 20?

• 15

• 40

• 10

• 4

Column A Column B

I. Gene ------------------------ A. Homozygote

II. TT -------------------------- B. DNA

III. Alternate form of gene---- C. Dihybrid cross

IV. TtRr x TtRr ---------------------- D. Allele

The correct match is –

• I – B, II – A, III – D, IV – C

• I – D, II – A, III – B, IV – C

• I – D, II – B, III – A, IV – C

• I – B, II – C, III – D, IV – A

Linkage is

• Stronger between genes located far away from each other upon the chromosome

• Stronger between genes located close together upon the chromosome

• Strength of linkage is not dependent upon the distance between the genes

• It depends upon the nature of the concerned genes

X and Y-chromosomes are

• Only morphologically similar

• Only morphologically dissimilar

• Morphologically as well as genetically dissimilar

• None are correct.