Monohybrid cross

Q.

What is the purpose of Dihybrid cross?

Q.

What are Monohybrid and Dihybrid cross?

Q.

A study found that children with light-coloured eyes are likely to have parents with light colored eyes. On this basis can we say anything about whether the light eye color trait is dominant or recessive? Why or why not? [3 MARKS]

Q.

Write down the difference between the following pair as indicated within the brackets:

Monohybrid and Dihybrid cross (Phenotypic ratio)

Q.

Label the organism or group of organisms in a typical monohybrid cross.

1. 1- Parental generation, 2- gametes, 3- F2 generation, 4- gametes , 5- F1 generation

2. 1- F1 generation, 2- gametes, 3- F2 generation, 4- gametes , 5- F3 generation

3. 1- Parental generation, 2- F1 generation, 3- gametes, 4- gametes , 5- F2 generation

4. 1- Parental generation, 2- gametes, 3- F1 generation, 4- gametes , 5- F2 generation

Q.

On crossing tall plants with dwarf plants, the percentage of dwarf plants in F2 generation, obtained by Mendel was________.

1. 
2. 
3. 
4. 

Q. If we cross breed a pure tall plant with a short plant, what is the ratio of tall plants to the short plants in the F2 progeny?

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

Q.

A homozygous round seeded plant (dominant trait) is crossed with a homozygous wrinkled seeded plant. What will be the percentage of round seeded plants in the F2 generation?

1. 25%

2. 50%

3. 75%

4. 100%

Q.

The hybrid progeny of the first generation is called as ………………………

1. F0

2. F1

3. F2

4. F3

Q.

Monohybrid cross parents should be always ………………………

1. have same allelic pair

2. be pure line and homozygous

3. a hybrid

4. both B and C

Q.

The phenotypic ratio of a monohybrid cross is _________

1. 3:1

2. 1:2:1

3. 4:1

4. 1:1

Q. how to calculate phenotypic and genotypic ratio?

Q.

Dominant character is represented by a capital letter and recessive by small letter. Which of the following alleleic pairs are possible in F1 generation ?

1. AA , Aa

2. TT, Tt

3. Both A and B

4. aa , tt

Q.

What will be the ratio of tall and dwarf plants in the F2 generation when a homozygous tall plant is crossed with homozygous dwarf plant?

1. 3:1

2. 2:1

3. 1:2:1

4. 1:1

Q. A cross between a tall plant (TT) and short plant (tt) resulted in progeny that were all tall plants because:

1. Shortness is the dominant trait
2. Tallness is the recessive trait
3. Tallness is the dominant trait
4. Shortness is not a trait of plants.