Principles of Inheritance and Variation MCQ | Principles of Inheritance and Variation NEET questions | Principles of Inheritance and Variation Class 12 important questions
Heredity and Variation: MCQs Quiz - 1
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Question 1 |
Individuals with Down syndrome have ______ copies of chromosome 21.
One | |
Two | |
Three | |
Four |
Question 2 |
Which of the followings is a well known autosomal abnormality at birth?
Klinefelter syndrome | |
Patau syndrome | |
Down syndrome | |
Turner syndrome |
Question 3 |
Mendel's principle of segregation means that the germ cells always receive
One pair of alleles | |
One quarter of the genes | |
One of the paired alleles | |
Any pair of alleles |
Question 4 |
The inactivated X chromosome is referred to as a _____ body.
Nuclear | |
Barr | |
Polar | |
Golgi |
Question 5 |
The genotype of a plant showing the dominant phenotype can be determined by
Back cross | |
Test cross | |
Dihybrid cross | |
Pedigree analysis |
Question 6 |
What is the pattern of inheritance called in which phenotype is influenced by many genes?
Polygenic inheritance | |
Epistasis | |
Monohybrid cross | |
Dihybrid cross |
Question 7 |
Select the incorrect statement from the following?
Baldness is a sex-limited trait | |
Linkage is an exception to the principle of independent assortment in heredity | |
Galactosemia is an inborn error of metabolism | |
Small population size results in random genetic drift in a population |
Question 8 |
Which one of the followings is assigned an uppercase letter?
Superior allele | |
Dominant allele | |
Inferior allele | |
Mutant allele |
Question 9 |
The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed
Transformation | |
Translocation | |
Crossing over | |
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 | |
B | |
AB | |
O |
Question 11 |
An individual who has two different alleles of a gene is called ______.
Allelopathic | |
Homozygous | |
Heterozygous | |
Codominant |
Question 12 |
The genotype is called a ______ when a person is heterozygous at two different loci.
Trihybrid | |
Dihybrid | |
Monohybrid | |
Mutant |
Question 13 |
Haploids are more suitable for mutation studies than the diploids. This is because
All mutations, whether dominant or recessive are expressed in haploids | |
Haploids are reproductively more stable than diploids | |
Mutagens penetrate in haploids more effectively than is diploids | |
Haploids are more abundant in nature than diploids |
Question 14 |
The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by
Enzyme replacement therapy | |
Periodic infusion of genetically engineered lymphocytes having functional ADA cDNA | |
Administering adenosine deaminase activators | |
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?
Factors occur in pairs | |
The discrete unit controlling a particular character is called a factor | |
Out of one pair of factors one is dominant, and the other recessive | |
Alleles do not show any blending and both the characters recover as such in F2 generation |
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THIS SITE IS AWESOME & I FEEL VERY HAPPY TO DOING SUCH TYPE OF CONCEPTUAL QUESTION THANKS ALLOT
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