Principles of Inheritance and Variation NEET questions | Class 12 | Online Test 02 7

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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 - 2

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Question 1
When the effects of both alleles are equally expressed in the heterozygote which one of the followings occurs?
A
Segregation
B
Codominance
C
Pleiotropy
D
Incomplete dominance
Question 2
Point mutation involves
A
Deletion
B
Insertion
C
Change in single base pair
D
Duplication
Question 3
Nondisjunction may occur due to the failure of ______ chromosomes to separate properly in meiosis I.
A
Defective
B
Heterozygous
C
Homologous
D
Autosomal
Question 4
Rh factor can produce life-threatening disease ______.
A
Erythroblastosis fetalis
B
Turner’s Syndrome
C
AIDS
D
Sickle cell anemia
Question 5
What is the composite display (paired and arranged according to size) of all the chromosomes of an organism called?
A
Linotype
B
Karyotype
C
Phenotype
D
Chromotype
Question 6
Which one of the followings is caused by a recessive allele of a gene on chromosome 7?
A
Phenylketonuria (PKU)
B
Tay-Sachs disease
C
Cystic fibrosis (CF)
D
Huntington disease
Question 7
ABO blood groups in humans are controlled by the gene l. It has three alleles – lA, lB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
A
Two
B
Three
C
One
D
Four
Question 8
During meiosis I, the ______ chromosomes of each pair come together to lie side by side.
A
Homologous
B
Homozygous
C
Heterozygous
D
Linked
Question 9
Which of the following pairs is correctly matched?
A
Sickle cell anemia - X chromosome
B
Down’s syndrome - 21st chromosome
C
Haemophilia - Y chromosome
D
Parkinson’s disease - X and Y chromosome
Question 10
______ are heterozygous with regard to only one pair of alleles.
A
Testcrosses
B
Dihybrids
C
Monohybrids
D
None of these
Question 11
Test cross is a cross between
A
Hybrid × Hybrid parent
B
Hybrid × Recessive parent
C
Hybrid × Dominant parent
D
Two distantly related species
Question 12
The Genetic deficiency of ADH-receptor leads to
A
Diabetes Insipidus
B
Glycosuria
C
Diabetes mellitus
D
Nephrogenic Diabetes
Question 13
Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?
A
Color blindness – Y-linked
B
Klinefelter’s syndrome – 44 autosomes +XXY
C
Down syndrome – 44 autosomes + XO
D
Erythroblastosis fetalis – X-linked
Question 14
Select the correct statement from the ones given below with respect to dihybrid cross
A
Tightly linked genes on the same chromosome show higher recombinations
B
Genes far apart on the same chromosome show very few recombinations
C
Tightly linked genes on the same chromosome show very few recombinations
D
Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones
Question 15
Which one of the followings is not correct for Huntington disease ________?
A
Caused by a dominant allele
B
Marked by progressive nerve degeneration
C
Causes tumors and affects the liver as well
D
Affects the brain leading to mental disability and death
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