Heredity and Evolution Test

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Heredity and Evolution Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

The main feature of Darwin's theory of evolution is:

A
Inheritance of acquired characters

B
Natural selection

C
Mutation

D
All of the above

Solution

The main feature of Darwin's theory is natural selection. He explained natural selection as the process that favours the individual with survival and/or reproductive advantage over others, under existing environmental conditions.
Thus, the correct answer is option D.
Question 2
1 / -0

In humans, an egg involved in male child formation has the genetic constitution of ____.

A
22 + X

B
22 + Y

C
44 + XY

D
44 + XX

Solution

Human follows XX- XY mechanism of sex determination. Human females have 46 chromosomes arranged in 22 autosomes and two copies of X chromosomes as sex chromosomes (44+XX). Males have 22 autosomes and the XY pair (44+XY) as sex chromosomes. All the gametes produced by females contain only the X chromosome (22 + X), whereas males produce two kinds of gametes, 1/2 gametes with X- and 1/2 with Y-chromosome (22 + X and 22 + Y). Fertilization of egg (22 + X) with sperm carrying 22+X chromosomes results in female child (44 + XX). Fertilization of egg (22 + X) with the sperm carrying 22+Y chromosomes results in a male child (44A + XY) as the zygote consists of two complete sets of chromosomes.
Thus, the correct answer is option A.
Question 3
1 / -0

A trait of organism is influenced by:

A
Paternal DNA

B
Maternal DNA

C
Both paternal and maternal

D
Neither Paternal and maternal
Solution
Correct Option: C

Explanation:
- An organism is a hybrid of its maternal and paternal traits and is called a recombinant.
- Therefore, both maternal and paternal traits are equally responsible for the traits of an organism.
Hence, a trait of organism is influenced by both paternal and maternal.
Question 4
1 / -0

The phenotypic ratio obtained by crossing a heterozygous parent (YyRy) with a recessive parent (yyrr) is:

A
9 : 3 : 3 : 1

B
3 : 1

C
1 : 1 : 1 : 1

D
None of the above

Solution

Parent 1: YyRr
Gametes: YR, Yr, yR, yr
Parent 2: yyrr, will produce all same gametes - yr
So, YyRr x yyrr:
Gametes YR Yr yR yr
yr YyRr Yyrr yyRr yyrr
Only four phenotypes will be observed in the progenies.
So, the phenotypic ratio will be 1:1:1:1
Thus, the correct answer is option C.
Question 5
1 / -0

If a couple has three daughters, what are the chances that the fourth child will be a son?

A
100%

B
75%

C
50%

D
0%

Solution

Each pregnancy has a 50% chance of resulting in a boy or girl and this does not include the possibility of multiples. Having 3 daughters previously does not affect the chances of any resulting pregnancy. The chance of having a boy remains at 50%. Thus, the correct answer is option C.
Question 6
1 / -0

Say Yes or No. Is it important that offsprings from the same parent should have common traits?

A
No

B
Yes

C
Maybe

D
None of the above

Solution

Siblings from the same parent can have different traits as they can occupy traits from either the mother or the father. Therefore, (a) is the correct answer.
Question 7
1 / -0

F1 generation consist of ____________ offspring.

A
Homozygous

B
Strong

C
Weak

D
Heterozygous

Solution

Every member of the F1 generation is heterozygous, the resultant offsprings produced are heterozygous having two different alleles each. Therefore, (d) is the correct answer.
Question 8
1 / -0

Human baby will be a female, if its 23$$^{rd}$$ chromosome pair is

A
XX

B
XY

C
YY

D
XYY

Solution

23$$^{rd}$$ chromosome pair in humans constitutes the sex chromosome. Y chromosome determines the sex in humans. The genetic makeup of a female is XX, whereas the genetic makeup of a male is XY.
Question 9
1 / -0

Who came up with the idea of evolution?

A
Mendel

B
Morgan

C
Charles Darwin

D
None of these

Solution

Charles Darwin came up with the idea of evolution of species with natural selection. Therefore, (c) is the correct answer.
Question 10
1 / -0

The Laws of Inheritance were proposed by _______________.

A
Charles Darwin

B
Robert Hooke

C
Newton

D
Gregor Mendel

Solution

Laws of inheritance were proposed by Gregor Mendel and were known as Mendel's laws of inheritance. He was the first to introduce that characteristic of parents can be in cooperated in the offsprings of the next generation. Therefore, (d) is the correct answer.

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Gametes	YR	Yr	yR	yr
yr	YyRr	Yyrr	yyRr	yyrr

Heredity and Evolution Test - 25

Result

Heredity and Evolution Test - 25

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Rank

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SHARING IS CARING

Question 1

Inheritance of acquired characters

Natural selection

Mutation

All of the above

Solution

Question 2

22 + X

22 + Y

44 + XY

44 + XX

Solution

Question 3

Paternal DNA

Maternal DNA

Both paternal and maternal

Neither Paternal and maternal

Solution

Question 4

9 : 3 : 3 : 1

3 : 1

1 : 1 : 1 : 1

None of the above

Solution

Question 5

100%

75%

50%

0%

Solution

Question 6

No

Yes

Maybe

None of the above

Solution

Question 7

Homozygous

Strong

Weak

Heterozygous

Solution

Question 8

XX

XY

YY

XYY

Solution

Question 9

Mendel

Morgan

Charles Darwin

None of these

Solution

Question 10

Charles Darwin

Robert Hooke

Newton

Gregor Mendel

Solution

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