Mendel's Dihybrid Experiments

Q.

In meiosis, the daughter cells are not similar to the parent because of

1. Both 1 and 2 above

2. Synapsis

3. Crossing over

4. None of the above

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. Which of the following statements about the four cells formed after meiosis is true?
(i) All of the four cells are haploid
(ii) Two of the four cells are haploid and the other two are diploid
(iii) They are genetically identical
(iv) They are genetically dissimilar

1. Only (i)
2. Both (i) and (ii)
3. Both (i) and (iv)
4. Both (ii) and (iv)

Q.

The phenotypic ratio for Mendel’s dihybrid cross is

1. 3:1

2. 1:2:1

3. 9:3:3:1

4. 1:1

Q.

How many types of gametes are obtained from a plant of genotype YYRr?

1. 1

2. 2

3. 4

4. Many

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.

Mendel’s typical dihybrid cross is

1. YyRr $\times$ YyRr

2. YYRr $\times$ yyrr

3. YYRR $\times$ yyrr

4. yyrr $\times$ yyrr

Q.

The gametes produced by Mendel’s $F_1$ dihybrid are

1. (YR) and (Yr)

2. (yR) and (Yr)

3. (YR) and (yR)

4. (YR), (Yr), (YR) and (yr)

Q. A breeding experiment was conducted in pea plant wherein the tallness of a plant was being studied. A pure tall plant was first taken as a male plant and then as the female plant in the second cross. The other plant in both the cases was a pure dwarf plant. The purpose of this experiment was primarily to find out

1. which allele is able to express itself in the heterozygous state
2. the role of parental sex on a given inheritance pattern
3. which was the dominant trait and which was the recessive trait
4. the reason of appearance of recessive character in F${}_2$ generation