Genetics And Plant Breeding - Study Mode
[#271] Production of breeder seed in requires on isolation distance of
Correct Answer
(B) 50 m
Explanation
Solution: Production of breeder seed requires an isolation distance of 50 m. Isolation distance is the minimum separation required between two or more varieties of the same species to keep the seed pure. A breeder is a hundred percent physical and genetic pure seed, also the progeny of the nucleus seed. It is multiplied in a large area as per the indent of the Department of Agriculture and Cooperation, under the supervision of the plant breeder and monitored by a committee consisting of the representatives of the state seed certification agency, ICAR nominee, and concerned breeder to maintain and check its purity.
[#272] The terms recon, muton and cistron were coined in 1957 by
Correct Answer
(C) Benzer
Explanation
Solution: The terms recon, muton, and cistron were coined in 1957 by Benzer. These terms were coined by Seymour Benzer in an article entitled “The elementary units of heredity.” Recon is the unit of recombination present in the DNA. Muton is the element of the DNA that is capable of undergoing mutation easily. The cistron was defined by an operational test applicable to most organisms that are sometimes referred to as a cis-trans test.
[#273] Emusculation means
Correct Answer
(A) Removal of anther
Explanation
Solution: Emasculation means the Removal of the anther. It is the process of removal of male reproductive organs i.e. anthers in plants without affecting female parts. It is usually done to prevent self-pollination in bisexual flowers and is widely used for the production of desired hybrids with desired traits.
[#274] Restore gene is needed
Correct Answer
(B) To bring fertility in male sterile plant
Explanation
Solution: A restore gene is needed to bring fertility in the male sterile plant. The restorer-of-fertility (Rf) nuclear genes have been used to rescue the damage induced by mitochondrial DNA rearrangements. Rf is a dominant allele for restoring male fertility and rf is its recessive allele inducing male sterility, in the presence of a male-sterile cytoplasm, S. N refers to normal cytoplasm that gives male-fertile plants in the presence of either the Rf or rf allele in the homozygous state.
[#275] Umbel inflorescence is found in
Correct Answer
(D) Coriander
Explanation
Solution: Umbel inflorescence is found in Coriander. An umbel is an inflorescence that consists of several short flower stalks that spread from a common point, somewhat like umbrella ribs. The word was coined in botanical usage in the 1590s, from Latin umbella "parasol, sunshade". An umbel is a type of indeterminate inflorescence. These are a characteristic of plants such as carrot, parsley, dill, and fennel in the family Apiaceae .