Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

Who discovered that chromosome number is fixed for a species.

A
Winiwater

B
Hertwig

C
Van Beneden

D
Boveri

Solution

Answer is option C i.e. "Van Beneden"
Van Beneden in 1887 discovered that each species has a fixed number of chromosomes in their body. In this work he also discovered the process for production of haploid gametes.
While, Hertwig discovered the process of fertilization in the sea-urchin.
Winiwarter in 1912, reported that there are 47 chromosomes in spermatogonia and 48 in oogonia.
Boveri along with Sutton gave chromosome theory of genetics which identifies chromosomes as the carriers of genetic material.
Question 2
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Identify the scientists from the hints given: (i) They used chromosome movement to explain Mendel's laws. (ii) They noted that behaviour of chromosomes was parallel to the behaviour of genes.

A
Morgan and Correns

B
De Vries and Boveri

C
Bridges and Correns

D
Bridges and Sutton

E
Sutton and Boveri
Question 3
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In our society women are blamed for producing a female child. Choose the correct answer for sex determination in humans due to

A
Some defect like aspermia in man

B
Genetic make up of particular sperm which fertilizes the egg

C
Genetic make up of egg

D
Some defect in reproductive system of women

Solution

In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively. Hence, Genetic make up of particular sperm plays a deciding role.

So, the correct answer is 'Genetic make up of particular sperm which fertilizes the egg'.
Question 4
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A Drosophila has XXXYY sex chromosomes. All the autosomal chromosomes are normal. The sexual phenotype will be.

A
Normal female

B
Super female

C
Intersexual

D
Male

Solution

A metafemale (or superfemale) is a low viability Drosophila fruit fly with a female phenotype in which the ratio of X chromosomes to sets of autosomes (A) exceeds 1.0. For example: a fly with one X chromosome and two sets of autosomes is a normal male, a fly with two X chromosomes and two sets of autosomes is a normal female, and a fly with three X chromosomes and two sets of autosomes (or four X chromosomes and three sets of autosomes) is a metafemale.

So, the correct answer is 'Super female'.
Question 5
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Choose the correct statements with reference to mutation theory :
(a) Mutations occur from time to time in naturally breeding population.
(b) Mutations are continuous and accumulate over generations.
(c) Mutations are full fledged and there are no intermediate forms.
(d) Mutations are not subjected to natural selection.

A
(b) and (c)

B
(a) and (b)

C
(c) and (d)

D
(a) and (c)

Solution

Mutations occur frequently in organisms though most of them are neutral. Mutation either results in certain change within a gene or it does not. There is no intermediate forms.
Mutations are discontinuous and do not necessarily accumulate over generations. As mutations might result in conditions that are either beneficial for the survival of an organism or harmful for it, hence they are subjected to natural selection.
So, the correct answer is '(a) and (c)'
Question 6
1 / -0

In this human pedigree the filled symbols represent the affected individuals. Identify the type of this pedigree.

A
Autosomal dominant

B
X-linked recessive

C
Autosomal recessive

D
X-linked dominant
Solution
Correct Option: C
Explanation:
The following information can be derived from the provided pedigree chart:
1. The feature occurs with equal frequency in both male and female individuals.
2. Affected offspring are born to unaffected or healthy parents.
3. The feature skips generations, i.e. it does not appear in every generation.
This information indicates that this pedigree chart depicts an autosomal recessive condition.
Hence, the human pedigree depicted by the filled symbol represents the affected individual which is an autosomal recessive type.
Question 7
1 / -0

From the pedigree chart of a family, one can make an analysis that it is on.

A
Autosomal dominant trait

B
Autosomal recessive trait

C
Allosomal dominant trait

D
Allosomal recessive trait

Solution

According to pedigree rule, Generation is skipped means its not a dominant trait, so it's sure it is a recessive trait.
Question 8
1 / -0

In which female has a pair of XX chromosomes?

A
Drosophila

B
Butterfly

C
Bulbul

D
Peafowl
Solution
- There are two types of heterogamety seen in organisms: female heterogamety and male heterogamety.
- In female heterogamety, the female parent produces two types of gametes (ZW) while the male parent produces only one type of gamete (ZZ). Female heterogamety seen in birds (such as bulbul, peafowl, etc) and butterflies.
- In male heterogamety, the male parent produces two types of gametes (XY or XO) while the female produces only one type of gamete (XX). Male heterogamety is seen in humans, grasshopper, Drosophila, etc.
Hence, the correct answer is option A, i.e., Drosophila.
Question 9
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Chick Pea is being grown in area where bacterial blight is common. What measures (a - d) should be taken
(a) Spraying Bordeaux mixture
(b) Controlling insect or vector of pathogen
(c) Use disease free seeds
(d) Use seeds of disease resistant variety.

A
c, d

B
a, d

C
b, c

D
a, b.
Question 10
1 / -0

In pedigree method of hybridisation upto which generation the plants are tested and released for cultivation

A
$$F_2$$ generation

B
$$F_3$$ generation

C
$$F_4$$ generation

D
$$F_6$$ generation.

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 65

Result

Principles of Inheritance and Variation Test - 65

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Rank

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SHARING IS CARING

Question 1

Winiwater

Hertwig

Van Beneden

Boveri

Solution

Question 2

Morgan and Correns

De Vries and Boveri

Bridges and Correns

Bridges and Sutton

Sutton and Boveri

Question 3

Some defect like aspermia in man

Genetic make up of particular sperm which fertilizes the egg

Genetic make up of egg

Some defect in reproductive system of women

Solution

Question 4

Normal female

Super female

Intersexual

Male

Solution

Question 5

(b) and (c)

(a) and (b)

(c) and (d)

(a) and (c)

Solution

Question 6

Autosomal dominant

X-linked recessive

Autosomal recessive

X-linked dominant

Solution

Question 7

Autosomal dominant trait

Autosomal recessive trait

Allosomal dominant trait

Allosomal recessive trait

Solution

Question 8

Drosophila

Butterfly

Bulbul

Peafowl

Solution

Question 9

c, d

a, d

b, c

a, b.

Question 10

$$F_2$$ generation

$$F_3$$ generation

$$F_4$$ generation

$$F_6$$ generation.

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