Mendel's Monohybrid Experiments

Q.

Two nonallelic genes produce the new phenotype when present together but fail to do so independently then it is called:

1. polygene

2. epistasis

3. complementary gene

4. non-complementary gene

Q.

Is YY homozygous or heterozygous?

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.

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

1. True

2. False

Q.

Which of the following laws did Mendel put forth based on his observations in the monohybrid cross?

1. Law of independent assortment

2. Law of dominance

3. Law of purity of gametes

4. Both B and C

Q. The phenotypic ratio of the monohybrid cross for tall:dwarf in the F2 generation is

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

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.

In Mendel’s experiments, the $F_1$ progeny resembles one of the two parents. The trait that is not seen is

1. recessive

2. dominant

3. superior

4. wild

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.

A cross is made between true breeding lines of pea plants with axillary (A) and terminal (a) flowers. What is the ratio between the number of possible genotypes of homozygous and heterozygous plants in ${\text{F}}_2$ progeny?

1. 3:1

2. 1:2:1

3. 1:1

4. 1:1:2

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.

Q.

If the two parents are heterozygous for a particular gene, how many different genotypes could possibly be seen in the $F_1$ generation?

1. One

2. Two

3. Three

4. Four

Q.

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

1. T & t

2. Tt

3. (T) & (t)

4. 

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