GPB MCQ Quiz 159 for ICAR JRF/SRF/ARS Exam Preparation

The syndrome refers to the characteristics of an abnormal female who has an XO chromosome constitution is

A) Turner’s syndrome

B) Klinefelter’s syndrome

C) Down syndrome

D) None of the above

Explanation: Turner’s syndrome is a chromosomal disorder in females characterized by a single X chromosome (XO).

The syndrome refers to the characteristics of an abnormal human male who has an XXY chromosome constitution is

A) Turner’s syndrome

B) Klinefelter’s syndrome

C) Down syndrome

D) None of the above

Explanation: Klinefelter’s syndrome occurs in males with XXY chromosome constitution, leading to infertility and other traits.

Allosomes are

A) Generally control traits other than sex

B) Usually determine sex of an individual

C) Both

D) None of the above

Explanation: Allosomes are sex chromosomes that determine the sex of an individual, unlike autosomes.

The theory according to which first crossing over occurs and then chiasma is formed is

A) Classical theory

B) Chiasma type theory

C) Copy choice theory

D) None of the above

Explanation: Chiasma type theory explains that crossing over occurs first, and chiasmata appear later as a result.

The theory which states that the entire recombinant section or part arises from the newly synthesized section is

A) Breakage and reunion theory

B) Classical theory

C) Copy choice theory

D) None of the above

Explanation: The copy choice theory suggests recombination occurs during DNA replication, with recombinant parts arising from newly synthesized sections.

The linkage of dominant allele with that of the recessive allele (Ab or aB) is known as

A) Coupling

B) Repulsion

C) Both

D) None of the above

Explanation: Repulsion refers to the situation where a dominant allele is linked with a recessive allele on the same chromosome.

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