Mendel's Dihybrid Experiments

Q.

In a dihybrid cross AABB $\times$ aabb, $F_2$ progency of AABB, AABb, AaBB and AaBb accurs in ratio of________

1. 1: 1 : 1 : 1

2. 9 : 3 : 3 : 1

3. 1 : 2 : 2 : 1

4. 1 : 2 : 2 : 4

Q. Which among the following are correct statements regarding the F${}_2$ generation obtained in Mendelian dihybrid cross?
(a) Phenotypic ratio 9 : 3 : 3 : 1
(b) Genotypic ratio 4: 2: 2: 1: 2: 1: 2: 1: 1
(c) $\frac{1}{4}$ plants are completely heterozygous.
(d) $F_2$ generation is obtained through selfing of $F_1$ plants.

1. a, c, d
2. a, b, c, d
3. b, c, d
4. a, b, c

Q. The drawing below shows a cell whose diploid chromosome number is four. This cell is in:

1. Anaphase of mitosis
2. Metaphase I
3. Second anaphase of meiosis
4. First anaphase of meiosis

Q.

A cross between pure-bred pea plants having yellow round seeds with those having green wrinkled seeds would produce ${\text{F}}_1$ plants with:

1. Round yellow seeds

2. Round green seeds

3. Wrinkled yellow seeds

4. Wrinkled green seeds

Q.

Ratio between parental types and recombinants in a typical dihybrid cross conducted by Mendel is ___.

1. 6:10

2. 5:3

3. 3:1

4. 1:1

Q.

The probability of the $F_1$ dihybrid producing gametes with two recessive genes is:

1. $\frac{1}{8}$

2. $\frac{2}{4}$

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

4. $\frac{3}{4}$

Q.

A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the F₁ plants are self pollinated, a total of 1600, F₂ plants are produced. In the same experiment how many $F_2$ plants show $F_1$ phenotype?

1. 900

2. 600

3. 300

4. 100

Q. In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the $F_2$ generation of the cross $RRYY\times rryy$?

1. Only round seeds with green cotyledons
2. Only wrinkled seeds with yellow cotyledons
3. Only wrinkled seeds with green cotyledons
4. Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons