Principles of Inheritance and Variation Test

Result

Principles of Inheritance and Variation Test - 34

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

In human beings, the colour of skin is controlled by which of the following?

A
Polygene

B
Lethal genes

C
Supplementary gene

D
None of the above

Solution

Polygene in simple words means multiple genes. Human skin colour, height, weight are good examples of polygenic inheritance. In polygenic inheritance, a single phenotypic character or trait is controlled by two or more genes. Skin colour is primarily due to the presence of a pigment called melanin. Melanin is controlled by at least 6 genes. Two forms of melanin are pheomelanin, which is red to yellow in colour and eumelanin, which is dark brown to black. An individual with fair complexion skin mostly produces pheomelanin while an individual with dark coloured skin mostly produce eumelanin. According to research, there are total 378 loci which are involved in determining the colour of skin in the human being.
Thus, the correct answer is option A.
Question 2
1 / -0

What is the name of genes exhibiting multiple effects?

A
Complementary genes

B
Pleiotropic genes

C
Cistrons

D
Pseudogenes

Solution

When one gene or gene cluster has multiple effects (more than one phenotype) it is called a pleiotropic gene. The phenomenon is called pleiotropism.
So, the correct answer is option B.
Question 3
1 / -0

This pedigree is of a rare trait, in which children have extra fingers and toes. Which one of the following patterns of inheritance is consistent with this pedigree?

A
Autosomal recessive

B
Autosomal dominant

C
Y linkage

D
Sex linked recessive

Solution

Males inherit a Y chromosome from their father. From the pedigree chart, the males are the only ones who are affected and it is the clear evidence of Y-linked disease.
So, the correct answer is 'Y linkage'
Question 4
1 / -0

A man homozygous for brown colour eyes marries a lady heterozygous for brown colour eyes is dominant. What will be the fate of their children?

A
All brown

B
Three brown

C
Two brown

D
None of the above

Solution

Homozygous for brown colour - male parent- XB Y
Heterozygous for brown - female parent - XB Xb
Offsprings: XB XB, XB Xb, XB Y, Xb Y
Question 5
1 / -0

Which of the following can be identified by using Pedigree chart?

A
Genetic diseases

B
Genetic diversity

C
Genetic mutation

D
Genetic drift

Solution

Pedigree chart is an easily readable chart showing family history or information, having a standardized symbols, where circles represents women and squares represents male. If sex is unknown, then in that case diamond symbol is used. Pedigree charts are constructed after a family member affected with a genetic disorder or disease has been identified. Pedigrees are used to find out the probability of a child having a disorder.
Question 6
1 / -0

Sickle cell anaemia is a/an

A
Autosomal dominant inheritance

B
X-linked recessive inheritance

C
Autosomal recessive inheritance

D
X-linked dominant inheritance

Solution

Sickle cell aneamia is autosomal recessive inheritance. The types of haemoglobin a person makes in the RBC depends on what haemoglobin genes are inherited from his or her parents. If one parent has sickle-cell aneamia (SS) and the other has sickle cell trait then there is a 50% chance of a child's having sickle-cell disease and a 50% chance of a child having sickle-cell trait.
Question 7
1 / -0

The process by which new alleles of a gene are produced can be termed as

A
Mutation

B
Gene manipulation

C
Genetic engineering

D
None of the above

Solution

The process by which new alleles of a gene are produced can be termed as mutation. It is a natural process that changes a DNA sequence and creates slightly different versions of the same genes, called alleles. These small differences in DNA sequence make every individual unique. They account for the variation we see in human hair color, skin color, height, shape, behavior, and susceptibility to disease. Hence, option A is correct.
Question 8
1 / -0

Mutation rates are affected by

A
Temperature

B
X-rays

C
$$\gamma$$- and $$\beta$$-radiation

D
All of the above

Solution

Mutation rate is a measure of the rate at which various types of mutations occur over time. It is affected by temperature, X-rays and $$\gamma$$- and $$\beta$$-radiation.
Question 9
1 / -0

In human beings, multiple genes are involved in the inheritance of

A
Colour blindness

B
Phenylketonuria

C
Sickle-cell anaemia

D
Skin colour

Solution

Skin colour is an example of multiple genic inheritance. It is also called as pleiotropism.
Question 10
1 / -0

If a diploid cell is treated with colchicine, then it becomes

A
Tetraploid

B
Diploid

C
Triploid

D
Monoploid

Solution

Colchicine inhibits the formation of microtubules that are involved in the formation of spindle fibers. These spindle fibers are necessary to equally divide the chromosomes in a parental cell into two daughter cells. If microtubules are not formed the genetic material will not be distributed in the two newly forming cells. Hence new cell formation will be inhibited in the metaphase stage and the diploid cell will have twice the number of chromosomes and it will become tetraploid. Thus the correct answer is option A.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 34

Result

Principles of Inheritance and Variation Test - 34

Score

-

Rank

-

SHARING IS CARING

Question 1

Polygene

Lethal genes

Supplementary gene

None of the above

Solution

Question 2

Complementary genes

Pleiotropic genes

Cistrons

Pseudogenes

Solution

Question 3

Autosomal recessive

Autosomal dominant

Y linkage

Sex linked recessive

Solution

Question 4

All brown

Three brown

Two brown

None of the above

Solution

Question 5

Genetic diseases

Genetic diversity

Genetic mutation

Genetic drift

Solution

Question 6

Autosomal dominant inheritance

X-linked recessive inheritance

Autosomal recessive inheritance

X-linked dominant inheritance

Solution

Question 7

Mutation

Gene manipulation

Genetic engineering

None of the above

Solution

Question 8

Temperature

X-rays

$$\gamma$$- and $$\beta$$-radiation

All of the above

Solution

Question 9

Colour blindness

Phenylketonuria

Sickle-cell anaemia

Skin colour

Solution

Question 10

Tetraploid

Diploid

Triploid

Monoploid

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.