Mendel's Monohybrid Experiments

Q.

What is back cross and test cross?

Q.

What is Mendels first law?

Q.

If E.coli with. Heavy DNA is allowed to grow for 80 minutes in a normal ${NH}_{4}Cl$ medium ratio of Light and heavy DNA is

Q.

What is Mendels first and second law?

Q.

Explain the Law of Dominance using a monohybrid cross.

Q.

Differentiate between:- test cross and back cross

Q. Blue eye colour is recessive to brown eye colour. A brown eyed man whose mother was blue eyed marries a blue-eyed woman. The children will be

1. both blue eyed and brown eyed 1 : 1

2. all blue eyed

3. all brown eyed

4. blue eyed and brown eyed 3:1.

Q.

Which among the following represents gametes produced by a parent with genotype Tt?

1. Tt

2. T & t

3. (T) & (t)

4. T & t

Q.

The phenotypic ratio obtained by crossing Mendel’s $F_1$ dihybrid with the recessive parent is

1. 3:1

2. 9:3:3:1

3. 9:7

4. 1:1:1:1

Q. A pea plant heterozygous for dominant trait having inflated pod and green seed is crossed with another heterozygous dominant pea plant having constricted pod and yellow seed. What is the probability of progeny having constricted pods and green
seeds? [3]

Q.

Explain the law of dominance using a monohybrid cross.

Q.

The $F_2$ genotypic ratio of Mendel’s monohybrid cross is ___.

1. 1:1

2. 3:1

3. 2:3

4. 1:2:1

Q.

What is an out cross?

Q.

How do you know if genes assort independently?

Q.

The phenotype of $F_1$ progeny, when pure tall and dwarf plants are crossed together is _________.

1. $50\%$ Tall and $50\%$ dwarf plants

2. $100\%$ dwarf plants

3. $75\%$ Tall and $25\%$ dwarf plants

4. $100\%$ tall plants

Q.

Test cross in plants or in Drosophila involves crossing:

1. between two F1 hybrids

2. between two genotypes with the recessive trait

3. between two genotypes with the dominant trait

4. the F1 hybrid with a double recessive genotype

Q.

Why test cross is called back cross?

Q. Out of the given traits for the characters pod shape and pod colour of a garden pea plant, which traits are dominant for that character?

1. Full and green pods
2. Constricted and yellow pod
3. Full and yellow pod
4. Constricted and green pod

Q.

Are blue eyes homozygous or heterozygous?

Q. Mendal performed test cross to know
A.Genotype of F1F1
B.Genoype of F2F2
Genotype of F3F3
Genotype of F4F4

Q.

The allele which is unable to express its effect in the presence of another is called:

1. Supplementary

2. Codominant

3. Recessive

4. Complementary

Q. Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring were analysed. Which of the following statements about this situation is correct?

1. Both parents are homozygotes.
2. The offspring are either all homozygotes or all heterozygotes
3. The offspring represent the $F_1$ generation and the gametes produced by the offspring will carry only one allele for this gene
4. All of the above

Q.

ABO blood group is an example of?

Q. Match column I with column II and select the correct option from the given codes.
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{A. Gregor J. Mendel}& \text{(i) Chromosomal theory of inheritance}\\ \text{B. Sutton and Boveri}& \text{(ii) Father of genetics}\\ \text{C. Henking}& \text{(iii) Fruit fly}\\ \text{D. Morgan}& \text{(iv) Discovered X - body}\end{array}$

1. A- (ii), B(i), C(iv), D(iii)
2. A- (iv), B(i), C(ii), D(iii)
3. A- (iv), B(ii), C(i), D(iii)
4. A- (ii), B(iii), C(iv), D(i)

Q.

The phenotype of $F_1$ progeny, when pure tall and dwarf plants are crossed together is _________.

1. 100% dwarf plants

2. 75% Tall and 25% dwarf plants

3. 100% tall plants

4. 50% Tall and 50% dwarf plants

Q.

In Mendel’s monohybrid cross of tall vs dwarf plants, the $F_1$ progeny are

1. Homozygous

2. Heterozygous

3. Hemizygous

4. Either a or b

Q.

Strength of linkage is related inversely to distance between

1. Genes

2. chromatids

3. telomeres

4. chromosomes

Q.

On selfing a plant of $F_1$ generation with genotype AABbCC, the phenotypic ratio in $F_2$ generation will be:

1. 3 : 1

2. 1 : 1

3. 9 : 3 : 3 : 1

4. 27 : 9 : 9 : 3 : 3 : 3 : 1

Q.

Mendel’s last law is

1. Dominance

2. Segregation

3. Polygenic inheritance

4. Independent assortment

Q.

When does offspring show a blend of the parents traits?