Genetics

Question 1

Which one of the following is the phenotypic monohybrid ratio in F2generation?

Answer 1

3 : 1

Question 2

If a pure tall plant is crossed with a pure dwarf plant, then offspring will be

Answer 2

all tall

Question 3

The 9 : 3 : 3 : 1 dihybrid ratio is due to

Answer 3

independent assortment

Question 4

The physical expression of a character is called :

Answer 4

Phenotype

Question 5

Purity of gametes is linked to :

Answer 5

Law of segregation

Question 6

The phenotypic dihybrid ratio of F2generation is

Answer 6

9:3:3:1

Question 7

In the human male, a sperm contains autosomes and :

Answer 7

X or Y chromosome

Question 8

If the mother is normal and the father is haemophilic, then their two daughters will be :

Answer 8

Carrier

Question 9

Name any two genetic diseases in humans.

Answer 9

Colour blindness and Haemophilia

Question 10

Pedigree chart

Answer 10

A pedigree chart is a diagram that shows the occurrence and appearance or phenotypes of a particular gene or organism and its ancestors from one generation to the next. In the pedigree chart, males are shown by squares and females by circles.

Question 11

Variations

Answer 11

The small differences among the individuals of the same species are called variations.

Question 12

Mutation

Answer 12

Mutation is a sudden change in one or more genes, or in the number or in the structure of chromosomes.

Question 13

State the three Mendel’s laws of inheritance.

Answer 13

,Law of Dominance

Law of Segregation

Law of Independent Assortment

Question 14

Karyotype and Karyokinesis

Answer 14

The complete set of chromosomes in the cells of an organism is its karyotype.

The division of the nucleus during mitosis is called karyokinesis.

Question 15

Difference between homozygous and heterozygous chromosomes

Answer 15

It has two same copies of the same allele coding for a particular trait.

It contains two different copies of alleles coding for a particular trait.