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Test: Genetics - 2 - Class 10 MCQ


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20 Questions MCQ Test Science Class 10 - Test: Genetics - 2

Test: Genetics - 2 for Class 10 2024 is part of Science Class 10 preparation. The Test: Genetics - 2 questions and answers have been prepared according to the Class 10 exam syllabus.The Test: Genetics - 2 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Genetics - 2 below.
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Test: Genetics - 2 - Question 1

How many types of gametes will be produced in F2 generation of a monohybrid cross of Mendel :-

Detailed Solution for Test: Genetics - 2 - Question 1

Each dihybrid plant produces 4 gamete types of equal frequency. In the offspring F2 showed 4 different phenotypes : the round and yellow traits did not stay linked to each other. 

Test: Genetics - 2 - Question 2

Considering tallness and dwarfness, tallness is more wide spread among pea plants because :-

Detailed Solution for Test: Genetics - 2 - Question 2

Explanation:

  • Most likely explanation for tallness being more widespread among pea plants is that tallness is dominant over dwarfness.
  • This means that even if a pea plant inherits the dwarf allele from one parent, it can still exhibit the tall phenotype if it inherits the tall allele from the other parent.
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Test: Genetics - 2 - Question 3

A red-flowered pea plant was crossed with white-flowered plant. In F1 generation all plants were red. It confirms that white colour is :-

Detailed Solution for Test: Genetics - 2 - Question 3

Explanation:

  • The fact that all plants in the F1 generation were red confirms that the white color is a recessive character.
  • This means that for a plant to have a white color, it must have two copies of the recessive allele (rr).
  • Therefore, the correct answer is A: Recessive character.
Test: Genetics - 2 - Question 4

A woman with straight hair mates with a man with curly hair who is known to be heterozygous for that trait. What is the chance that their first child will have curly hair :-

Detailed Solution for Test: Genetics - 2 - Question 4

Explanation:

  • Here are the possible combinations of genes for their first child:
  • The child can inherit the straight hair gene from both parents (SS). In this case, the child will have straight hair.
  • The child can inherit the straight hair gene from the mother and the curly hair gene from the father (SC). In this case, the child will have straight hair, as the dominant straight hair gene overrides the recessive curly hair gene.
  • The child can inherit the curly hair gene from both parents (CC). In this case, the child will have curly hair.
  • Therefore, out of the three possible combinations of genes, two result in the child having straight hair and one results in the child having curly hair.

Conclusion:
The chance that their first child will have curly hair is one in two (1/2) or 50%.

Test: Genetics - 2 - Question 5

The main reason of Mendel's successs in discovering the principles of inheritance was :-

Detailed Solution for Test: Genetics - 2 - Question 5

In conclusion, Mendel's success in discovering the principles of inheritance can be attributed to his systematic approach, the traits he chose to study, the absence of genetic linkage, and the use of pure-breeding plants. These factors allowed him to make accurate observations, establish patterns of inheritance, and formulate the fundamental laws of genetics.

 

Test: Genetics - 2 - Question 6

Mendel was lucky in the choice of the material of his experiments, among the following, which contributed, to his success ?

Detailed Solution for Test: Genetics - 2 - Question 6

Explanation:

  • Mendel's interest and passion for studying pea plants played a crucial role in his success.
  • Pea plants possess several advantages for genetic research, such as their short generation time, large number of offspring, and easily observable traits.
  • Mendel's fondness for pea plants motivated him to conduct numerous experiments and meticulously analyze the results, leading to his groundbreaking discoveries in genetics.
  • Therefore, among the given options, the factor that most significantly contributed to Mendel's success was his decision to consider only one character at a time (option D).
Test: Genetics - 2 - Question 7

Genotype means :-

Detailed Solution for Test: Genetics - 2 - Question 7

The genotype of an organism is the chemical composition of its DNA, which gives rise to the phenotype, or observable traits of an organism. A genotype consists of all the nucleic acids present in a DNA molecule that code for a particular trait

Test: Genetics - 2 - Question 8

An organism with two identical alleles of a gene is a cell is called :-

Detailed Solution for Test: Genetics - 2 - Question 8

Diploid organisms, for example, humans, have paired homologous chromosomes in their somatic cells, and these contain two copies of each gene.

An organism in which the two copies of the gene are identical — that is, have the same allele — is called homozygous for that gene.

Test: Genetics - 2 - Question 9

When an individual is having both the alleles of contrasting characters it is said to be :-

Detailed Solution for Test: Genetics - 2 - Question 9

When an individual is having both the alleles of a contrasting character, it is said to be HETEROZYGOUS .

Test: Genetics - 2 - Question 10

If a plant is heterozygous for tallness, the F2 generation has both tall and dwarf plants. This proves the principle of :-

Detailed Solution for Test: Genetics - 2 - Question 10


 

In F2 -3 tall : 1 dwarf This is the law of segregation. 1 Homozygous tall 1 Homozygous dwarf 2 Heterozygous tall.

Test: Genetics - 2 - Question 11

Mendel crossed a pure white flowered recessive pea plant with a dominant pure red flowered plant. The first generation of hybrids from the cross should show :-

Detailed Solution for Test: Genetics - 2 - Question 11

All red flowered plants; according to Mendel's law of dominance. 

Test: Genetics - 2 - Question 12

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

Detailed Solution for Test: Genetics - 2 - Question 12

Almost everyone has around a 50% chance of having a boy and a 50% chance of having a girl. What we can say is that dad's sperm determines whether a baby will be a boy or a girl. About half of his sperm will make a boy and half a girl. The sex of the baby depends on which sperm gets to the egg first.

Test: Genetics - 2 - Question 13

If a heterozygous tall palnt is crossed with a homozygous dwarf palnt, the proportion of dwarf progeny will:-

Detailed Solution for Test: Genetics - 2 - Question 13

To determine the proportion of dwarf progeny, let's analyze the cross between a heterozygous tall plant (Tt) and a homozygous dwarf plant (tt).
Genotype of tall plant: Tt
Genotype of dwarf plant: tt
When these two plants are crossed, the possible genotypes of the progeny are as follows:
1. Tt (tall)
2. Tt (tall)
3. tt (dwarf)
4. tt (dwarf)
From these genotypes, we can see that 2 out of 4 possible genotypes (50%) will result in dwarf progeny.
Therefore, the proportion of dwarf progeny is 50% (option A).
Test: Genetics - 2 - Question 14

The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of :-

Detailed Solution for Test: Genetics - 2 - Question 14

The crossing of homozygous tall plant with a dwarf would yield plants in the ratio of 3:1 in F2 generation, i.e. 3 tall and one dwarf. This is phenotypic ratio. Genotypic ratio is 1:2:1, i.e., one homozygous tall, one homozygous dwarf and two heterozygous tall.

Test: Genetics - 2 - Question 15

When a true breeding tall plant is crossed with a true breeding short plant and the F1 produced is self pollinated to produce F2 ratio of true breeding tall and true breeding short plant in F2 will be :-

Detailed Solution for Test: Genetics - 2 - Question 15

Explanation:
When a pure tall plant (TT) is crossed with the pure short plant (tt), then the progeny in the F1 generation will be hybrid (Tt). When the F1 generation is self-crossed (Tt), then in the F2 generation, the progeny produced will be tall homozygous (TT), Tall heterozygous (Tt), and dwarf homozygous in the ratio of 1:2:1. This type of cross between single pair of contrasting characters is called a monohybrid cross. The tall and dwarf plants were produced in a ratio of 3:1 (75% tall plants and 25% dwarf plants). But in the given question, the ratio of pure tall plants to short plants in F2 will be 1:1.
Answer: B. 1 : 1

Test: Genetics - 2 - Question 16

Allosomes are :-

Detailed Solution for Test: Genetics - 2 - Question 16

The human sex chromosomes are a typical pair of allosomes. These chromosomes determine the sex of an individual when reproducing. Allosomes are also referred to as sex chromosomes or idiosomes

Test: Genetics - 2 - Question 17

Mutation is :-

Detailed Solution for Test: Genetics - 2 - Question 17

A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke.

Test: Genetics - 2 - Question 18

"Barr body" is derived from :-

Detailed Solution for Test: Genetics - 2 - Question 18

The Barr body, also sometimes called the sex chromatin, is the inactive X chromosome in female somatic cells. Human females have two X chromosomes, while males have one X and one Y. In all of the female somatic cells, which don’t take part in sexual reproduction, one of the X chromosomes is active.

Test: Genetics - 2 - Question 19

The DNA is the genetic material was proved conclusively by :-

Detailed Solution for Test: Genetics - 2 - Question 19

In 1952, Hershey & Chase were the ones to conclusively prove that DNA is the genetic material. They worked with bacteriophages – viruses that infect bacteria. A bacteriophage attaches and delivers its genetic material into a bacterial cell, where it generates more virus particles.

Test: Genetics - 2 - Question 20

Nobel Prize for "one gene one enzyme theory" was given to :-

Detailed Solution for Test: Genetics - 2 - Question 20

The proof for the fact that protein synthesis occurs through enzymes was given by George Beadle and Edward Tatum. They proposed the one gene one enzyme theory. According to this theory, one gene accounts for producing one protein. The scientists won the Nobel Prize for this concept in 1958.

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