Heredity and Evolution Test

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Heredity and Evolution Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

In human beings, the gametes from the _______ decides the sex of the baby.

A
Male parent

B
Female parent

C
Both A and B

D
Environment factors
Solution
- Sex is determined by two chromosomes, X and Y. A female is XX, a male is XY.
- Since women completely lack the Y chromosome, they always contribute an X chromosome to the baby. The sex of the baby is determined by, whether the sperm that fertilizes the egg is carrying chromosome Y or another X.
- Thus, the correct answer is A.
Question 2
1 / -0

Multiple alleles are characterized by

A
More than two alternate forms of genes found at different loci

B
More than two alternate forms of genes found on same loci

C
One gene occurs in two chromosomes

D
None of the above

Solution

Multiple alleles are defined as more than two alternate forms of genes found on the same loci. These are a type of non-Mendelian inheritance pattern that involves more than just the typical two alleles that usually code for a certain characteristic in a species. With multiple alleles that means there is more than two phenotypes available depending on the dominant of recessive alleles that are available in the trait and the dominance pattern the individual alleles follow when combined together.
Example, blood group in humans.
So, the correct answer is 'More than two alternate forms of genes found on same loci'
Question 3
1 / -0

Physical features of the body are known as:

A
Phenotype

B
Genotype

C
Allele

D
Gene

Solution

Phenotype is the physical expression of the genotype. It is physically expressed character. The phenotype of an organism depends on which genes are dominant and on the interaction between genes and environment.
Example: Genotype Tt - is responsible for phenotype tallness.
Thus, the correct answer is option A.
Question 4
1 / -0

How many different types of genotypes are formed in the second generation of a cross between a homozygous dominant parent and a homozygous recessive parent?

A
1

B
2

C
3

D
4

Solution

This question can be solved with the help of a cross between a homozygous tall pea plant (TT) and a homozygous dwarf pea plant (tt).
Gametes T T
t Tt Tt
t Tt Tt
So, all the F1 progeny will have tall pea plants (Tt), since tallness (T) is the dominant trait.
On self-fertilizing the F1 progeny:
Gametes T t
T TT Tt
t Tt tt
3 different genotypes are obtained: TT (tall), Tt (tall), tt (dwarf).
So, the correct answer is option C.
Question 5
1 / -0

Consider the following statements relating to evolution and answer the question.

(i) Organisms are products of a history of descent with modification.
(ii) Characteristics acquired by an organism during its lifetime are inherited by its offspring.
(iii) The goal of evolution is to adapt organisms to the environment.
(iv) Evolutionary change is brought about by natural selection.

The theory of evolution presented in Darwin's "The Origin of Species" depended on what combination of these statements?

A
(i) and (ii)

B
(i) and (iv)

C
(ii) and (iv)

D
(iii) and (iv)

Solution

"Origin of Species" is a work of scientific literature by Charles Darwin which throws light on the variations caused during evolution which leads to natural selection for the survival. Evolution brings a remarkable change in the morphology, anatomy and genetics of a living organism which helps them to adjust in a better manner in the environment and coordinate with the fluctuating conditions with time. These changes create variations generation after generation.
Therefore, the correct answer is option B.
Question 6
1 / -0

Which of these structures would be used for grasping?

A
1

B
2

C
3

D
4

E
5

Solution

Homologous organs are the organs that are similar in morphology but they perform different functions e.g., Forelimbs of frog, reptile, birds, and mammals., where we observe leaping in the frog, crawling in reptiles, flying in birds, running and grasping in mammals.
Even though the bone structure in these limbs of the mammals is very similar, the function of the limb itself is very different. The homologous limbs can be used for flying, swimming, walking, or everything humans do with their arms. These functions evolved through natural selection as the common ancient ancestor underwent speciation to make all of the diversity we have on Earth today.
So, 1 is the hand of a human used for grasping.
Thus, option A is correct.
Question 7
1 / -0

An individual with genotype SsTtUu will produce _______ gametes.

A
4 types

B
All of the same

C
8 different types

D
4 of one type and rest of one type

Solution

It will produce the number of combinations = 8. The possible combinations are: STU, STu, StU, Stu, sTU, stU, sTu and stu.
Question 8
1 / -0

Monohybrid cross F$${_1}$$ progeny Tt is inbred. What will be the maximum types of F$${_2}$$ genotypes?

A
3

B
2

C
4

D
1

Solution

So, in the given case there would be 3 types of genotypes TT, Tt, tt.
Hence, the correct option is A.
Question 9
1 / -0

Potato and sweet potato

A
Have edible parts which are homologous organs

B
Have edible parts which are analogous organs

C
Have been introduced in India from the same place

D
Are two species of the same genus
Solution
Correct Option- B
Explanation-
Analogous organs can be defined as the organs of two different organisms which have different origins and have varying structures but they have similar functions.
Potato and sweet potato is an example of the analogous organs
Potato is the stem of the plant while the sweet potato is actually the adventitious roots of the plant
But both the structures perform the same function that is storage of food material.
Hence, the correct option is option B.
Question 10
1 / -0

The year 1900 AD is highly significant for geneticists due to the

A
Discovery of genes

B
Principle of Linkage

C
Mendelian rediscovery

D
Chromosome theory of heredity

Solution

Mendel's work got recognition after his death. Before mendelian inheritance, the blending inheritance was considered as the reason for transmission of characters from parents to offspring. DeVries, Correns, and Tschermak independently rediscovered Mendel's work in 1900, a generation after Mendel publishes his papers. They helped expand awareness of the Mendelian laws of inheritance in the scientific world.
So, the correct answer is option C.

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Gametes	T	T
t	Tt	Tt
t	Tt	Tt

Gametes	T	t
T	TT	Tt
t	Tt	tt

Heredity and Evolution Test - 21

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Heredity and Evolution Test - 21

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SHARING IS CARING

Question 1

Male parent

Female parent

Both A and B

Environment factors

Solution

Question 2

More than two alternate forms of genes found at different loci

More than two alternate forms of genes found on same loci

One gene occurs in two chromosomes

None of the above

Solution

Question 3

Phenotype

Genotype

Allele

Gene

Solution

Question 4

1

2

3

4

Solution

Question 5

(i) and (ii)

(i) and (iv)

(ii) and (iv)

(iii) and (iv)

Solution

Question 6

1

2

3

4

5

Solution

Question 7

4 types

All of the same

8 different types

4 of one type and rest of one type

Solution

Question 8

3

2

4

1

Solution

Question 9

Have edible parts which are homologous organs

Have edible parts which are analogous organs

Have been introduced in India from the same place

Are two species of the same genus

Solution

Question 10

Discovery of genes

Principle of Linkage

Mendelian rediscovery

Chromosome theory of heredity

Solution

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