Genetics And Plant Breeding - Study Mode
[#591] The production of hybrid seeds through male sterility requires
Correct Answer
(C) Male Sterile line, Maintainer line, Restorer line
Explanation
Solution: The production of hybrid seeds through male sterility requires a Male Sterile line, Maintainer line, and Restorer line. Incorporating male sterility into hybrid seed production reduces its cost and ensures high varietal purity. In a maintainer line (M), its cytoplasm is male fertile (normal) which interacts with a recessive male-sterile nuclear gene to jointly perform male-fertile phenotype. The restorer line is used to restore the fertility in the hybrid after crossing with the ms A line in the hybrid production plot.
[#592] The notified variety of tomato is
Correct Answer
(D) All of the above
Explanation
Solution: The notified variety of tomatoes is PKM 1, Pusa ruby, and CO3. PKM 1: It is an induced mutant from Annanji.Fruits are flat and round with prominent green shoulder and are suitable for long-distance transport. Yield is 30 - 35 tonnes/ha in a crop duration of 135 days. Pusa Ruby: Variety is released by IARI, New Delhi. It is an early-growing cultivar, with fruits a have yellow stem ends, slightly furrowed with uniform ripening. CO3: It is a hybrid between HN 2 × CLN 2123A. Yields about 96.2 tonnes/ha in a crop duration of 140 - 145 days. Plants are semi-determinate (90 - 95 cm) and suitable for high-density planting.
[#593] In mass selection, selection of plants is made on the basis of
Correct Answer
(A) Phenotypes
Explanation
Solution: In mass selection, the selection of plants is made based on Phenotypes. In mass selection, seeds are collected from desirable appearing individuals in a population, and the next generation is sown from the stock of mixed seeds. This procedure sometimes referred to as phenotypic selection, is based on how each individual looks.
[#594] Which of the following compound contains cobalt
Correct Answer
(B) Vitamin B 12
Explanation
Solution: Vitamin B 12 is one of the following compounds that contain cobalt. Vitamin B 12 is also known as cobalamin, it contains cobalt. It plays an essential role in red blood cell formation, cell metabolism, nerve function, and the production of DNA, the molecules inside cells that carry genetic information. Food sources of vitamin B 12 include poultry, meat, fish and dairy products.
[#595] The genotypic ratio of progenie in a dihybrid test cross is
Correct Answer
(D) 1 : 1 : 1 : 1
Explanation
Solution: The genotypic ratio of progeny in a dihybrid test cross is 1 : 1 : 1 : 1. A dihybrid cross describes a mating experiment between two organisms that are identically hybrid for two traits. A dihybrid test cross is obtained by crossing any one parent with a heterozygous condition from the F1 generation with a parent which is double homozygous and recessive. The ratio obtained is 1 : 1 : 1 : 1.