Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

The ……… or gene constitution of an individual heterozygous for L is written as………

A
Genotype, LI

B
Phenotype, LI

C
Both of these

D
None of these

Solution

The term "genotype" refers to the genetic makeup of an organism; in other words, it describes an organism's complete set of genes. The process of determining a genotype is called genotyping.
Question 2
1 / -0

The hybrid ratio of 9 : 3 : 3 : 1 proves the law of ……….

A
Law of Dominance

B
Law of independent assortment

C
Law of segregation

D
All of these

Solution

One of these principles, now known as Mendel's law of independent assortment, states that allele pairs separate during the formation of gametes. This means that traits are transmitted to offspring independently of one another. Mendel concluded that traits were transmitted to offspring independently.
Question 3
1 / -0

The plant……….. that shows incomplete dominance with respects to colour of its flowers.

A
Mirabilis Jalapa / Antirrhinum

B
Pea plant

C
Mango

D
Apple

Solution

Mirabilis Jalapa, the marvel of Peru or four o'clock flower, is the most commonly grown ornamental species of Mirabilis plant, and is available in a range of colours. Mirabilis in Latin means wonderful and Jalapa (or Jalapa) is the state capital of Veracruz in Mexico.
Question 4
1 / -0

A plant with genotype AABbCC is selfed. F₂ phenotypic ratio be a

A
9: 3: 3 :1

B
1: 1

C
3: 1

D
27: 9 : 9: 9 : 3 :3 : 3 : 1

Solution

When AABbCC is selfed, we get genotypes Now on taking cases:

(a) Crossing btw AABBCC and AABbCC

We get AABBCC and AABbCC only. So we get only dominant phenotype

(b) Crossing btw AABbCC and AAbbCC

We get AABbCC and AABbCC in ratio 1:1

(c) Crossing btw AABBCC and AABbCC

We get AABbCC only, so only dominant phenotype.

So as we get only 2 phenotypes, and dominant type is more common

AABBCC, AABbCC, AAbbCC.
Question 5
1 / -0

A family has three children with a blood group A; B and AB. They genotypes of the parents are

A
I^AI^Aand I^Bi

B
I^Ai,I^Bi

C
I^AI^B, and ii

D
I^BI^B and I^AI^A

Solution

Human blood type is determined by co dominant alleles. There are three different alleles, known as I^A,I^B, and i. The I^A and I^B alleles are co-dominant, and the i allele is recessive.
Question 6
1 / -0

One of the genes present exclusively on the X – chromosome in human is concerned with

A
Baldness

B
Facial hair / moustaches in males

C
Red green colour blindness

D
Night blindness

Solution

The faulty 'gene' for colour blindness is found only on the X chromosome. ... A daughter can become a carrier in one of two ways – she can acquire the 'gene' from a carrier mother or from a colour blind father. This is why red/green colour blindness is far more common in men than women.
Question 7
1 / -0

A person with blood group A possesses

A
Antigen A and antibody B

B
Antigen B and antibody a

C
Antigen A and antibody b

D
No antigen no antibody

Solution

Blood group A indicates they have A antigens. (If there are A antigens but no B nor Rh antigens, the antibodies in the blood plasma are B and Rh antibodies.) The blood type notation A Rh- indicates which antigens and antibodies are present in the blood.
Question 8
1 / -0

Test cross is crossing between

A
Genotype with dominant trait

B
Genotype with recessive trait

C
F₁ hybrid with double recessive

D
Two F₁ hybrids

Solution

A test cross is made between an organism exhibiting the dominant trait (and thus carrying the unknown dominant genotype) and another organism displaying the recessive trait. If the recessive trait is manifested in any of their progenies it means that the unknown genotype is heterozygous dominant.
Question 9
1 / -0

What would be blood groups of the progeny of the father A and mother homozygous B

A
A and B

B
AB and A

C
O

D
AB and B

Solution

AB only if the father is also homozygous. If not, the children will have a 50% chance of being AB and a 50% chance of being B.

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Principles of Inheritance and Variation Test - 18

Result

Principles of Inheritance and Variation Test - 18

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SHARING IS CARING

Question 1

Genotype, LI

Phenotype, LI

Both of these

None of these

Solution

Question 2

Law of Dominance

Law of independent assortment

Law of segregation

All of these

Solution

Question 3

Mirabilis Jalapa / Antirrhinum

Pea plant

Mango

Apple

Solution

Question 4

9: 3: 3 :1

1: 1

3: 1

27: 9 : 9: 9 : 3 :3 : 3 : 1

Solution

Question 5

IAIA and IBi

IAi,IBi

IAIB, and ii

IBIB and IAIA

Solution

Question 6

Baldness

Facial hair / moustaches in males

Red green colour blindness

Night blindness

Solution

Question 7

Antigen A and antibody B

Antigen B and antibody a

Antigen A and antibody b

No antigen no antibody

Solution

Question 8

Genotype with dominant trait

Genotype with recessive trait

F1 hybrid with double recessive

Two F1 hybrids

Solution

Question 9

A and B

AB and A

O

AB and B

Solution

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I^AI^Aand I^Bi

I^Ai,I^Bi

I^AI^B, and ii

I^BI^B and I^AI^A

F₁ hybrid with double recessive

Two F₁ hybrids