Genetics And Plant Breeding - Study Mode

[#316] Law of parallel variation was given by
Correct Answer

(B) Vavilov

Explanation

Solution: The Law of parallel variation was given by Vavilov. It was given by Vavilov in 1920 and was published in the Journal of Genetics in 1922. This law established a parallel variability of homologous characters in taxonomically near species. Now it must be extended, including also a parallel variability of similar homologous characters in taxonomically remote species.

[#317] The telomerase activity is highest in
Correct Answer

(B) Embryonic cells

Explanation

Solution: The telomerase activity is highest in embryonic cells. Embryonic cells have high levels of telomerase activity during rapid proliferation. Although telomerase activity is diminished in non-proliferating sperms and ova, it is highly activated after fertilization and maintained in ES cells and germ cells for the next generation.

[#318] The neurotoxin present in Lathyrus is
Correct Answer

(B) BOAA

Explanation

Solution: The neurotoxin present in Lathyrus is BOAA. Lathyrism, a paralytic disease is caused by the extensive use of seeds of Lathyrus sativus. A nonprotein amino acid, P-N-Oxalylamino-L-alanine (BOAA) present in these seeds is found to be responsible for this effect. Some of these amino acids and their amine derivatives are neurotoxic to both humans and animals.

[#319] Protein involved in keeping the DNA single stranded during replication is
Correct Answer

(D) SSB protein

Explanation

Solution: The protein involved in keeping the DNA single stranded during replication is SSB protein. During DNA replication, the single-stranded DNA binding protein (SSB) wraps single-stranded DNA (ssDNA) with high affinity to protect it from degradation and prevent secondary structure formation. Although SSB binds ssDNA tightly, it can be repositioned along ssDNA to follow the advancement of the replication fork.

[#320] The breeder seed crop is inspected by
Correct Answer

(C) Monitoring team

Explanation

Solution: The breeder seed crop is inspected by the Monitoring team. Breeder seed is monitored by a joint inspection team of scientists and officials of certification agency and National Seed Corporation. The genetic purity of breeder seed crops should be maintained at 100 percent. A golden yellow colour certificate is issued for this category of seed by the producing breeder.