Heredity and Variation: MCQs Quiz – 1 14


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Solve online MCQs (Multiple Choice Questions) on Heredity and Variation with answers and test reporting. Test No. 1

Heredity and Variation: MCQs Quiz - 1

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Question 1
Individuals with Down syndrome have ______ copies of chromosome 21.
A
One
B
Two
C
Three
D
Four
Question 2
Which of the followings is a well known autosomal abnormality at birth?
A
Klinefelter syndrome
B
Patau syndrome
C
Down syndrome
D
Turner syndrome
Question 3
Mendel's principle of segregation means that the germ cells always receive
A
One pair of alleles
B
One quarter of the genes
C
One of the paired alleles
D
Any pair of alleles
Question 4
The inactivated X chromosome is referred to as a _____ body.
A
Nuclear
B
Barr
C
Polar
D
Golgi
Question 5
The genotype of a plant showing the dominant phenotype can be determined by
A
Back cross
B
Test cross
C
Dihybrid cross
D
Pedigree analysis
Question 6
What is the pattern of inheritance called in which phenotype is influenced by many genes?
A
Polygenic inheritance
B
Epistasis
C
Monohybrid cross
D
Dihybrid cross
Question 7
Select the incorrect statement from the following?
A
Baldness is a sex-limited trait
B
Linkage is an exception to the principle of independent assortment in heredity
C
Galactosemia is an inborn error of metabolism
D
Small population size results in random genetic drift in a population
Question 8
Which one of the followings is assigned an uppercase letter?
A
Superior allele
B
Dominant allele
C
Inferior allele
D
Mutant allele
Question 9
The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed
A
Transformation
B
Translocation
C
Crossing over
D
Chromosomal aberration
Question 10
In blood group typing in human, if an allele contributed by one parent is IA and an allele contributed by the other parent is i, the resulting blood group of the offspring will be
A
A
B
B
C
AB
D
O
Question 11
An individual who has two different alleles of a gene is called ______.
A
Allelopathic
B
Homozygous
C
Heterozygous
D
Codominant
Question 12
The genotype is called a ______ when a person is heterozygous at two different loci.
A
Trihybrid
B
Dihybrid
C
Monohybrid
D
Mutant
Question 13
Haploids are more suitable for mutation studies than the diploids. This is because
A
All mutations, whether dominant or recessive are expressed in haploids
B
Haploids are reproductively more stable than diploids
C
Mutagens penetrate in haploids more effectively than is diploids
D
Haploids are more abundant in nature than diploids
Question 14
The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by
A
Enzyme replacement therapy
B
Periodic infusion of genetically engineered lymphocytes having functional ADA cDNA
C
Administering adenosine deaminase activators
D
Introducing bone marrow cells producing ADA into cells at early embryonic stages
Question 15
Which one of the following cannot be explained on the basis of Mendel’s Law of Dominance?
A
Factors occur in pairs
B
The discrete unit controlling a particular character is called a factor
C
Out of one pair of factors one is dominant, and the other recessive
D
Alleles do not show any blending and both the characters recover as such in F2 generation
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14 thoughts on “Heredity and Variation: MCQs Quiz – 1

  • kajal choudhary

    THIS SITE IS AWESOME & I FEEL VERY HAPPY TO DOING SUCH TYPE OF CONCEPTUAL QUESTION THANKS ALLOT

  • avijit

    according to me question number 2 is wrong as patau and down syndrome both are autosomal recessive defects
    patau syndrome- trisomy of 13
    down syndrome- trisomy of 21

  • mohd shariq

    according to me answer of question no.7 is wrong it should be option c because galactosemia is a inborn disease of metabolism.

    • Praddy

      no galactosemia is not an inborne disease…..a human eye has a small canal called as d canal of schlem inorder to avoid flow of blood molecules in d eye ball………wen ur blood contains glucose molecules (specifically in a diabetic patient) d canal gets blocked n d person suffers frm dis disease so its nt inborn……n if u check an ncert bk u vill find dat baldness is a y-linked disorder n yeah it is a sex linked disease n only seen in males……….so d answer is a correct 1!

    • sanjeeda afrin

      it is right that galactosemia is an inborn error of metabolism. but the mcq is what is the incorrect opt??? here opt. a- baldness is a sex linked disease , but truly baldness is an autosomal dominant disease. so the incorrect option is opt-a.

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