Question

A. MULTIPLE CHOICE TYPE
(Select the most appropriate option)
1. Which one of the following is the phenotypic
monohybrid ratio in F, generation ?
(a) 3:1
(b) 1:2:1
(c) 2:2
(d) 1:3

2. If a pure tall plant is crossed with a pure dwarf
plant, the offsprings will be
(a) all tall
(b) all dwarf
(c) 3 tall 1 dwarf
(d) 50% tall 50% dwarf

3. The 9:3: 3:1 dihybrid ratio is due to :
(a) Segregation
(b) crossing over
(c) independent assortment
(d) homologous pairing

4. A plant with green pots and smooth seeds with genotype Ggss will give rise to the fallowing gametes:

(a) Gg and Ss
(b) Gs and ss
(c) Gs and gs
(d) Gg and gs​

Answer 1

Answer:

1) a) 3:1.

2) a) all tall.

3) c) independent assortment.

4 c) GS and gs.

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Answer 2

1. (a) 3:1 is the correct answer.

2. (a) all tall is the correct answer.

3. (c) independent assortment is the correct answer.

4. (c)Gs and gs is the correct answer.

Explanation:-

1. A monohybrid cross is a cross between two individuals and each of them has a different allele for a single trait. The phenotypic monohybrid ratio in  F 2generation is 3:1. Whereas 1:2:1 is the genotypic ratio for  F 2  generation. So, (a) 3:1 is the correct answer.
2. If a pure tall plant is crossed with a dwarf plant, the offspring produced in the F1  generation are all tall plants. So, (a) all tall is the correct answer.
3. The 9:3: 3:1 dihybrid ratio is due to (c) independent assortment. so, (c) independent assortment is the correct answer.
4. A plant with green pots and smooth seeds with genotype Ggss will give rise to the following gametes Gs and gs. so, (c). Gs and gs is the correct answer.