MCQ ON GENETIC DISORDERS class 12 for NEET | THE GENETIC DISORDERS class 12 | MCQ GENETIC DISORDERS with Answer | Check the below NCERT MCQ question for class 12 Biology chapter 05 based on the with Answers.
MCQ ON GENETIC DISORDERS class 12
MCQ on GENETIC DISORDERS class 12 Biology with answers were prepared based on the latest pattern.We have provided class 12 Biology MCQs questions on GENETIC DISORDERS with Answers to help students understand the concept very well.
MCQ ON GENETIC DISORDERS is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM 2022-23, 2023-24
Introduction:
Genetics deals with the inheritance , as well as the variation of characters from parents to offspring . Inheritance is the process by which characters are passed on from parent to progeny; it is the basis of heredity.Variation is the degree by which progeny differ from their parents.
A number of disorders in human beings have been found to be associated with the inheritance of changed or altered genes or chromosomes.
MCQ ON GENETIC DISORDERS class 12 for NEET
1. It is sex – linked recessive disorders due to defect in either red or green cone of eye resulting in failure to discriminate between red and green colour.
(a) haemophilia
(b) sickle- cell anaemia
(c) phenylketonuria
(d) colour blindness
Ans (d) colour blindness
2. The autosome linked recessive trait that can be transmitted from parents to offspring when both the partners are carrier for the gene .This disease is controlled by a single pair of allele, HbA HbS.
(a) haemophilia
(b) sickle- cell anaemia
(c) phenylketonuria
(d) thalassemia
Ans. (b) sickle-cell anaemia
3. Bleeder disease is
(a) colour blindness
(b) albinism
(c) haemophilia
(d) Rh+ factor
Ans. (c) haemophilia
4.The diseases is caused by substitution of Glutamic acid by valine at sixth position of the beta globin chain of the heamoglobin molecule.
(a) haemophilia
(b) thalassemia
(c) phenylketonuria
(d) sickle-cell anaemia
Ans.(d) sickle cell anaemia
5. The disease which is inborn error of metabolism affected individuals lacks an enzyme that converts the amino acid phenylalanine into tyrosine.
(a) sickle cell anaemia
(b) thalassemia
(c) phenylketonuria
(d) haemophilia
Ans.(c) phenylketonuria
6. Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome,called
(a) aneuploidy
(b) supplementary
(c) complementary
(d) polyploidy
Ans.(a) aneuploidy
7. Down ‘s syndrome is due to
(a) crossing over
(b) linkage
(c) sex – linked inheritance
(d) nondisjunction of chromosomes
Ans.(d) nondisjunction of chromosomes
8. A sex linked recessive is
(a) colour blindness/haemophilia
(b) night blindness/ albinism
(c) myxoedema/ beri-beri
(d) deafness/tylosis
Ans.(a) colour blindness/haemophilia
9. A colour blind man has a colour blind sister but normal brother .The phenotype of parents is
(a) normal father and colour blind mother
(b) both parents are normal
(c) both parents are colour blind
(d) father colour blind and mother normal
Ans. (d) father colour blind and mother normal
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10. In mongolism / down’s syndrome
(a) Barr body
(b) trisomy
(c) monosomy
(d) nullisomy
Ans. (b) trisomy
11. In Alzheimer’s disease brain cells donot metabolise
(a) glucose
(b) amyloid beta peptide
(c) GABA
(d) acetylcholine
Ans.(b) amyloid beta peptide
12. Allele for cystic fibrosis occurs over
(a) 21 chromosomes
(b) 14 chromosomes
(c) 7 chromosomes
(d) 4 chromosomes
Ans . (c) 7 chromosomes
13. Cystic fibrosis is caused by
(a) recessive autosomal allele
(b) dominant autosomal allele
(c) recessive sex linked allele
(d) dominant sex linked allele
Ans.(a) recessive autosomal allele
15. The genetic disorders caused due to the presence of an additional copy of X- chromosome resulting into karyotype of 47.
(a) Down’s syndrome
(b) Klinfelter’s syndrome
(c) Turner’s syndrome
(d) thalassemia
Ans. (b) Klinfelter’s syndrome
16. The genetic disorders is caused due to the absence of one of the X chromosome , i.e. 45 with XO .
(a) Down’s syndrome
(b) Klinfelter’s syndrome
(c) haemophilia
(d) Turner’s syndrome
Ans.(d) Turner’s syndrome
17. Gynaecomastia is expressed in
(a) down’s syndrome
(b) Klinfelter’s syndrome
(c) Turner’s syndrome
(d) thalassemia
Ans.(b) Klinfelter’s syndrome
18. Palm is broad with characteristics palm crease, physical psychometer and mental development is retarded, … symptoms are of
(a) Klinfelter’s syndrome
(b) Turner’s syndrome
(c) down’s syndrome
(d) sickle cell anaemia
And.(c) down’s syndrome
19. Down ‘ s syndrome , Turner’s syndrome and Klinfelter’s syndrome are common examples of
(a) chromosomal disorders
(b) reciprocal cross
(c) monohybrid cross
(d) autosomal linked recessive
Ans. (a) chromosomal disorders
20. Genes located on Y – chromosomes are
(a)mutant genes
(b) sex- linked genes
(c) autosomal genes
(d) holandric genes
Ans.(d) holandric genes
21. Number of X chromosome in Turner’s syndrome is
(a) 3
(b) 2
(c) 1
(d) 0
Ans. (c) 1
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