Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 79

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is not true?

A
Mutation is change in genetic material

B
Total number of chromosome is $$46$$ is Down's syndrome

C
Chromosomal mutation can be easily studied by analysis of Karyotypes

D
Both $$(2)$$ and $$(3)$$

Solution

Answer is B.
(2).In Down syndrome has an extra chromosome (47 instead of 46) or one chromosome has an extra part. This extra genetic material causes problems with the way their bodies develop.
Question 2
1 / -0

Mendelian dihybrid and dihybrid with linkage are respectively related with how many chromosomes.

A
$$1$$ pair & $$2$$ pair

B
$$2$$ pair & $$1$$ pair

C
$$2$$ pair & $$2$$ pair

D
$$1$$ pair & $$1$$ pair
Question 3
1 / -0

A cross between AaBB$$\times$$aaBB yields a genotypic ratio of?

A
$$1$$ AaBB $$: 1$$ aaBB

B
$$1$$ AaBB $$: 3$$ aaBB

C
$$3$$ AaBB $$: 1$$ aaBB

D
All AaBb
Question 4
1 / -0

In pea plant, genotype(Bb) shows?

A
Round seed with large size starch grain

B
Round seed with intermediate sized starch grain

C
Round seed with small sized starch grain

D
Wrinkled seed with small sized starch
Question 5
1 / -0

In garden pea, gene controlling starch synthesis related to all of the given phenomenon, except

A
Pleiotropy

B
Incomplete dominance

C
Codominance

D
Complete dominance

Solution

Pleiotropy occurs when one gene influences two or more unrelated phenotypic traits. So, pleitrophy cannot play a role in gene controlling starch synthesis.
Question 6
1 / -0

Which of the following pedigree charts does not represent inheritance of disorders like myotonic distrophy?

A

B

C

D
Question 7
1 / -0

Total number of genotypes and phenotypes in a dihybrid test cross is?

A
$$9$$

B
$$8$$

C
$$16$$

D
$$13$$
Question 8
1 / -0

Which of the following disease is an autosomal recessive?

A
Phenylketonuria

B
Haemophilia

C
Sickle cell anaemia

D
Both (a) & (b)
Question 9
1 / -0

For the alleles $$A,B,C,D$$ where, $$A=B>C=D$$ the number of phenotypes obtained will be

A
4

B
7

C
8

D
6

Solution

In the 4 alleles for the character two of them are $$A=B$$, and $$C=D$$ are co-dominant, therefore total number of phenotypes obtained will be $$4+2=6$$
So, the correct answer is '6'
Question 10
1 / -0

White eye mutation leads to depigmentation in many parts of the body in Drosophila. It is referred as

A
Multiple alleles

B
Polymorphic effect

C
Pleiotropic effect

D
Morphan syndrome