Mendel's Monohybrid Experiments

Q. What will be the percentage of gametes having recessive alleles for both the genes, if produced by a plant with genotype TtRr?

1. 50%
2. 30%
3. 12.5%
4. 25%

Q.

What is a heterozygous genotype?

Q. Which of the following statement(s) is /are correct regarding the Mendelian dihybrid cross?
A. The F2 phenotypic ratio is 9 : 3 : 3 : 1
B. Law of independent assortment can be explained on the basis of the dihybrid cross
C. F2 generation is obtained through the cross between F1 plants with one of the two parental plants
D. The gametes produced by F1 plants are of 4 types in 1:1:1:1 ratio.

1. A, B, D
2. A, C, D
3. B, C, D
4. A, B, C, D

Q. Multiple alleles are:

1. more than one allele in a gamete for a particular gene
2. more than two alleles of a gene located on the same chromosome of the same person
3. more than two alleles of a gene in an individual
4. more than two forms of a gene in a population

Q. In a dihybrid cross, when one pair of alleles show incomplete dominance, genotypic ratios are

1. 9:3:3:1
2. 1:2:1
3. 3:6:3:1:2:1
4. 1:2:2:4:1:2:1:2:1

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.

In a plant red colour fruit is dominant over yellow colour. When these two pure lines are crossed, the probability of producing $F_2$ homozygous plants with red fruits, heterozygous plants with red fruits, and plants with yellow colored fruits respectively is

1. $\frac{1}{4}$ , $\frac{1}{4}$ , and $\frac{2}{3}$

2. $\frac{1}{4}$, $\frac{1}{2}$ and $\frac{1}{4}$

3. $\frac{3}{4}$ , $\frac{1}{2}$ and $\frac{1}{4}$

4. $\frac{1}{4}$, $\frac{3}{4}$ and $\frac{1}{4}$

Q. If a pea plant producing yellow seeds (Yy) is crossed with a plant producing green seeds (yy), what ratio of plants producing yellow and green seeds would you expect in $F_1$ generation?

1. 9 : 1
2. 3 : 1
3. 1 : 1
4. 1 : 3

Q.

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

1. T & t

2. Tt

3. (T) & (t)

4. 

Q.

Recessive character appears in $25\%$ of the ${\text{F}}_2$ progeny in Mendel’s monohybrid cross.

1. True

2. False

Q.

A cross is made between true breeding lines of pea plants with axillary and terminal flowers. If 1240 progeny are obtained, how many plants are homozygous with axillary flowers and heterozygous with axillary flowers in the $F_2$ generation?

1. 310 & 620

2. 620 & 620

3. 310 & 310

4. 620 & 310

Q.

The genotype of $F_1$ hybrid produced by crossing pure yellow round seeded plant with green wrinkled seeded plant is ___.

1. Double homozygous

2. Double heterozygous

3. Homozygous for one character and heterozygous for the other

4. Homozygous for both characters

Q. A character that is expressed in the F1 generation is called . The recessive character will be expressed in the generation plants.

1. recessive
2. dominant
3. F1
4. F2

Q.

In a plant, red colour of the fruit is dominant over yellow colour. When these two pure bred varieties are crossed, the $F_2$ progeny have

1. All plants with red colored fruits

2. $50\%$ of plants with red fruits and $50\%$ with yellow fruits

3. $75\%$ of plants with red fruits and $25\%$ with yellow fruits

4. $25\%$ of plants with yellow fruits and $50\%$ with red fruits.