Genetics And Plant Breeding - Study Mode

[#951] The visible scar (spot) observed on a seed at the place of the detachment from seed stalk is known as
Correct Answer

(C) Hillum

Explanation

Solution: The visible scar (spot) observed on a seed at the place of the detachment from seed stalk is known as Hillum. A hilum is a scar or mark left on a seed coat by the former attachment to the ovary wall or to the funiculus (which in turn attaches to the ovary wall). On a bean seed, the hilum is called the "eye". A hilum can also be a nucleus of a starch grain

the point around which layers of starch are deposited.

[#952] In fig the inflorescence is
Correct Answer

(C) Hypanthodium

Explanation

Solution: In fig the inflorescence is Hypanthodium. Hypanthodium is a special type of cymose inflorescence. The Hypanthodium inflorescence is found in the genus Ficus of the family Moraceae, e.g., Banyan (Ficus bengalensis), Peepal (Ficus religiosa) and Fig (Ficus carica). The receptacle in this type of inflorescence becomes spherical, like a hollow sphere with a cavity inside, and it is formed by the fusion of the rachis of the three cymes in the vicinity of each other. These spherical receptacles are like a closed fleshy vessels having a tiny opening at the apex

it opens to the exterior with this opening.

[#953] The smallest unit of genetic material that can not be divided but is interchangeable among units refers to
Correct Answer

(C) Recon

Explanation

Solution: The smallest unit of genetic material that cannot be divided but is interchangeable among units refers to Recon. A term coined by Seymour Benzer for the smallest recombinable unit within a cistron. A region of a gene within which there can be no crossing-over
now known to be a single nucleotide pair that is Recon.

[#954] Mass selection is rerely used in
Correct Answer

(C) A sexually propagated species

Explanation

Solution: Mass selection is rarely used in a sexually propagated species. In mass selection, several individuals chosen based on appearance are mated
their progeny are further selected for the preferred characteristics, and the process is continued for as many generations as is desired. It applies to both self and cross-pollinated species. It is a method of crop improvement in which plants are selected from a mixed population based on their phenotype.

[#955] The terms Muton, Recon and Cistron was coined by
Correct Answer

(C) Benzer

Explanation

Solution: The terms Muton, Recon and Cistron were coined by Benzer. Muton is the smallest element of genetic material capable of undergoing a distinct mutation, usually identified as a single pair of nucleotides. A region of a gene within which there can be no crossing-over
now known to be a single nucleotide pair is termed a Recon. A term coined by Seymour Benzer for the smallest combinable unit within a cistron. It is a section of a DNA or RNA molecule that codes for a specific polypeptide in protein synthesis.