GPB MCQ Quiz 169 for ICAR JRF/SRF/ARS Exam Preparation

During gametic formation the cell containing both dominant and both recessive genes underwent mitotic reproduction to a greater extent than the others, thereby giving specific ratio is called

A) Duplication hypothesis

B) None of the above

C) Both

D) Reduplication hypothesis

Explanation: The reduplication hypothesis explains the specific ratio observed when certain gametes undergo more mitotic divisions during gametic formation.

In higher plants and animals, macrogametes contain large amount of cytoplasm but microgametes have essentially negligible amount of cytoplasm, therefore, under such condition most of cytoplasmic factors are transmitted to the offspring through the ovary. This is known as

A) Trans-ovarian transmission

B) None of the above

C) Maternal inheritance

D) Both

Explanation: Cytoplasmic factors are mostly transmitted through the ovary, a phenomenon referred to as both maternal inheritance and trans-ovarian transmission.

The tendency of genes to be inherited in groups is called

A) Linkage

B) Recombination

C) Non-disjunction

D) None

Explanation: Linkage is the tendency of genes located close together on the same chromosome to be inherited together.

The original parental gene arrangement on the homologous chromosomes is called parental combination, and the new gene combinations arising out of crossing over are called

A) Cross over types

B) Exchange products

C) None

D) All of above

Explanation: Parental combinations remain the same, while crossing over produces new gene combinations, known as exchange products or cross over types.

The hypothesis represents the best explanation to date to account for the formation of recombinants is

A) Darlington's theory of crossing over

B) Unit theory

C) Belling’s copy choice theory

D) Janssen’s classical theory

Explanation: Darlington's theory of crossing over best explains the formation of recombinant gene combinations during meiosis.

Most of the cytoplasmically inherited characters would follow the maternal (mother) lines; i.e. called

A) Uniparental mode of transmission

B) Maternal inheritance

C) Transovarian transmission

D) None of the above

Explanation: Cytoplasmically inherited characters are typically transmitted uniparentally through the maternal line.

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