Genetics And Plant Breeding - Study Mode

[#961] Diffused centromere means
Correct Answer

(C) Centromere is nonlocalised and spread over chromosome

Explanation

Solution: Diffused centromere means Centromere is nonlocalized and spread over the chromosome. Diffuse centromeres - in asexual organisms where the offspring is an exact genetic copy of the parent, there are limited sources of genetic variability. The chromosomes are characterized by large size, sinuous shape, and sticky matrix
the chromatids are parallel at anaphase, separate at metaphase throughout their length
the centromere is 'diffuse'.

[#962] Recommended concentration of EMS for induced mutagensis is
Correct Answer

(A) 0.03 to 1.5%

Explanation

Solution: The recommended concentration of EMS for induced mutagensis is 0.03 to 1.5%. Ethyl methanesulfonate (EMS) is a mutagenic, teratogenic, and carcinogenic organic compound with formula C 3 H 8 SO 3 . It produces random mutations in genetic material by nucleotide substitution
particularly through G:C to A:T transitions induced by guanine alkylation. EMS typically produces only point mutations. EMS can induce mutations at a rate of 5 × 10 -4 to 5 × 10 -2 per gene without substantial killing.

[#963] The cell walls of fungi are made up of
Correct Answer

(B) Chitin

Explanation

Solution: The cell walls of fungi are made up of Chitin. The cell wall is a characteristic structure of fungi and is composed mainly of glucans, chitin, and glycoproteins. The fungal cell wall is made of a chitin-glucan complex
while glucans are also found in plants and chitin in the exoskeleton of arthropods, fungi are the only organisms that combine these two structural molecules in their cell wall.

[#964] Global Gene Bank of rice is located in
Correct Answer

(D) None of these

Explanation

Solution: Global Gene Bank of rice is located in Los Baños, Philippines. It is an independent, nonprofit, research and educational institute, founded in 1960 by the Ford and Rockefeller foundations with support from the Philippine government. The International Rice Research Institute is the world’s premier research organization dedicated to reducing poverty and hunger through rice science
improving the health and welfare of rice farmers and consumers
and protecting the rice-growing environment for future generations.

[#965] Translocation involves
Correct Answer

(A) Homologous chromosomes

Explanation

Solution: Translocation involves Homologous chromosomes. Translocations are the transfer of genetic material between homologous chromosomes. These are most commonly balanced exchanges, such that no genetic material is lost and individuals are phenotypically normal. The centric translocation of homologous chromosomes can occur between 13
13, 14
14, 15
15, 21
21 and 22
22.