GPB MCQ Quiz 175 for ICAR JRF/SRF/ARS Exam Preparation

The linkage of genes which are located in sex chromosomes are called

A) Incomplete linkage

B) Autosomal linkage

C) X chromosomal linkage

D) None

Explanation: Genes located on sex chromosomes exhibit X-chromosomal linkage.

Three-point cross helps in mapping of chromosome, provides which following useful information

A) About the sequence of genes

B) About the recombination frequencies between genes

C) None

D) Both

Explanation: Three-point cross gives information about both the gene sequence and recombination frequencies.

The character includes characteristics not related to sex is called

A) Sex-linked character

B) Sex-limited character

C) Sex-influenced character

D) None

Explanation: Sex-linked characters are those associated with sex chromosomes, but the term can include non-sex-determined traits located on these chromosomes.

Colour blindness in man is

A) Sex-linked character

B) Sex-limited character

C) Sex-influenced character

D) None

Explanation: Colour blindness is an X-linked recessive trait in humans.

The syndrome which possess the characteristics of an abnormal human chromosome constitution is called

A) Turner’s syndrome

B) Klinefelter’s syndrome

C) None

D) Both

Explanation: Klinefelter’s syndrome is caused by the presence of an extra X chromosome in males (XXY).

Model which explains the accurate replication of DNA

A) Dispersive replication

B) Conservative replication

C) Semiconservative replication

D) All of the above

Explanation: The semiconservative model accurately explains DNA replication; all three models were historically proposed, but only semiconservative is correct.

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