Engineering Questions with Answers - Multiple Choice Questions

MCQs on Sex Determination

1 - Question

Genes of sex linked characters are located on the ___________
a) Chromosome 18
b) Chromosome 13
c) Chromosome 14
d) Sex chromosome

View Answer

Answer: d
Explanation: The characters are said to be sex linked if their genes are located on the sex chromosome. According to modern genetics, the x-chromosome linked character is called sex-linked character while y-linked characters are called male limited characters.

2 - Question

In sex linkage, reciprocal cross yield identical results.
a) True
b) False

View Answer

Answer: b
Explanation: In the case of sex linkage reciprocal cross do not yield identical results, but it shows a criss-cross inheritance pattern, i.e. male transmits its sex linked genes to all daughters who in turn transmit them to half of their male progeny.

3 - Question

Which of the following is X-linked recessive disorder?
a) Color blindness
b) Sickle cell anemia
c) PTC tasting
d) Albinism

View Answer

Answer: a
Explanation: In humans, three proteins in the cons cells act as color sensors, the two color sensors are encoded by X-linked genes while one is encoded by a gene located on the seventh autosome.

4 - Question

. Which of the following statement is NOT true regarding Partial sex linkage?
a) The X-Y chromosome pair during meiosis
b) Pairing occurs in the terminal region
c) The inheritance pattern in the PAR region show sex-linkage
d) PAR stands for the pseudo autosomal region

View Answer

Answer: c
Explanation: The inheritance pattern of the genes present in such terminal regions (PAR) of the sex chromosome is not like that of sex-linked genes but it resembles that of autosomal genes.

5 - Question

Identify the disease which causes excessive production of uric acid.
a) Duncan muscular dystrophy
b) Lesch-Nyhan syndrome
c) Hunter syndrome
d) Hemophilia

View Answer

Answer: b
Explanation: Lesch-Nyhan syndrome is an X-linked disorder which is the example of congenital hyperuriemic (excessive production of uric acid). It causes HGPRT (Hypoxanthine Guanine Phosphoribosyl Transferase) gene defective.

6 - Question

Which of the following characteristics does not belong to the Hunter syndrome?
a) Muscular deterioration
b) Abnormal hairiness
c) Mental retardation
d) Long protruding tongue

View Answer

Answer: a
Explanation: Hunter syndrome is an X-linked recessive disorder where the affected person have long protruding tongue and mental retardation while muscular deterioration occurs in another disorder called Duncan muscular dystrophy.

7 - Question

Which of the following is NOT a sex-limited role?
a) Pitch of voice
b) Musculature
c) Baldness
d) Milk production

View Answer

Answer: c
Explanation: Baldness is a sex-influenced character, not a sex-limited character. Sex-limited characters are those whose development is limited to only one of the two sexes.

8 - Question

Which of the following disease is characterized by excessive trinucleotide repeats (CAG)?
a) Cystic fibrosis
b) PTC tasting
c) Dwarfism
d) Huntington’s disease

View Answer

Answer: d
Explanation: Huntington’s disease is an autosomal disorder which is caused by excessive trinucleotide repeats, approx 50 to 100 times more than normal condition.

9 - Question

What is pedigree analysis?
a) Record of inheritance pattern
b) Linkage map
c) Quantitative genetic
d) Polygene analysis

View Answer

Answer: a
Explanation: Pedigree is a record of inheritance of certain genetic traits for two or more than two generations presenting in the form of a diagram.

10 - Question

Name the principle on which pedigree analysis work?
a) Regression
b) Probability
c) Random mating

View Answer

Answer: b
Explanation: Pedigree analysis is used to study the transmission genetics where controlled process is not possible and it works on the principle of probability.

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