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Test: Heredity - UPSC MCQ


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15 Questions MCQ Test Science & Technology for UPSC CSE - Test: Heredity

Test: Heredity for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Heredity questions and answers have been prepared according to the UPSC exam syllabus.The Test: Heredity MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Heredity below.
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Test: Heredity - Question 1

Homologous organ have

Detailed Solution for Test: Heredity - Question 1

Homologous organs share a common evolutionary origin, which means they have similar anatomical structures but may serve different functions in different species. The similarity in structure suggests a common ancestry despite differences in function.

Test: Heredity - Question 2

What is the role of genes in controlling characteristics or traits?

Detailed Solution for Test: Heredity - Question 2

Genes play a crucial role in controlling characteristics or traits of organisms by providing instructions for making specific proteins. Proteins are essential molecules that perform a wide range of functions in the body, including regulating growth, metabolism, and other processes that ultimately determine an organism's physical appearance, behavior, and other traits.

Test: Heredity - Question 3

The traits which are expressed in first filial (F1) generation are known as which traits.​

Detailed Solution for Test: Heredity - Question 3

One parent is homozygous for one allele, and the other parent is homozygous for the other allele. The offspring make up the first filial (F1) generation. Every member of the F1 generation is heterozygous and the phenotype of the F1 generation expresses the dominant trait.

Test: Heredity - Question 4

The number of successful variations are maximized by the process of:

Detailed Solution for Test: Heredity - Question 4

The number of successful variations are maximised by the process of sexual reproduction. If we observe a field of sugarcane we find very little variations among the individual plants. But in a number of animals including human beings, which reproduce sexually, quite distinct variations are visible among different individuals.

Test: Heredity - Question 5

Which of the following act as an information source for making proteins in a cell ?

Detailed Solution for Test: Heredity - Question 5

The DNA in the nucleus of a cell is the information source for making proteins. If the information is changed, different proteins will be made.

Test: Heredity - Question 6

Genes are segments of:

Detailed Solution for Test: Heredity - Question 6

A gene is a segment of DNA that is passed down from parents to children and confers a trait to the offspring.

Test: Heredity - Question 7

A pea plant shows the genetic makeup TtRr. How will the plant appear externally ?

Detailed Solution for Test: Heredity - Question 7

Tall with round seeds

Since tallness of plant and round shape of seeds are dominant characters, these will be expressed in F2 generation.

Test: Heredity - Question 8

The number of differences that appear in the new progeny in case of sexual reproduction is termed as ?

Detailed Solution for Test: Heredity - Question 8

"Variation" refers to the differences that appear among the offspring (progeny) of a sexually reproducing organism. When two parents with different genetic backgrounds contribute genetic material to create offspring, the resulting individuals can exhibit a wide range of traits and characteristics due to the combination of genes from both parents. This variation is essential for the process of evolution, as it provides the raw material upon which natural selection can act.

Test: Heredity - Question 9

If two pairs of characters are crossed in pea plants, then they show an independent inheritance because:

Detailed Solution for Test: Heredity - Question 9

Genes located on different chromosomes will be inherited independently of each other.

Test: Heredity - Question 10

The normal number of chromosomes in the progeny is maintained when the germ cells:

Detailed Solution for Test: Heredity - Question 10

Each cell has two copies of chromosome one inherited from each mother and father. Every germ cell is taking one chromosome from each pair that may from either maternal origin or paternal. When these two germ cell combine, they restore the normal no. of the chromosome in the progeny maintaining the stability of DNA

Test: Heredity - Question 11

Exchange of genetic material takes place in

Detailed Solution for Test: Heredity - Question 11

Explanation: Sexual reproduction involves the participation of two parents for the process of reproduction. During fertilization, the fusion of male and female gametes results in the creation of a zygote with a full set of chromosomes. This leads to the sharing of genetic information between the parents.

Test: Heredity - Question 12

A zygote which has an X-chromosome inherited from the father will develop into a

Detailed Solution for Test: Heredity - Question 12

Explanation: 

Humans follow XX- XY mechanism of sex determination.

Test: Heredity - Question 13

How do proteins control characteristics or traits in organisms?

Detailed Solution for Test: Heredity - Question 13

Explanation:  Protiens can play a crucial role in controlling characteristics or traits in organisms and also can affect the efficiency of processes like hormone production, which, in turn, can impact the expression of traits. 

Test: Heredity - Question 14

 A trait in an organism is influenced by_______.

Detailed Solution for Test: Heredity - Question 14

Explanation:The genetic material for a child is equally contributed by both parents. An organism develops from zygote which in turn is product of fusion of male and female gamete.

Test: Heredity - Question 15

 From the options given below, select the character which can be acquired but not inherited?

Detailed Solution for Test: Heredity - Question 15

Since the size of body can vary person to person according to lifestyle and diet  and is not same from generation to generation.For e.g., A fat boy can have a slim father or mother or both.
Skin complexion or skin color is an inherited characteristic. Hair is a trait that is passed down through generations so it is an inherited characteristic.

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