Genetics And Plant Breeding - Study Mode
[#681] Hybrid progeny from a cross between two inbreds is known as
Correct Answer
(A) Single cross hybrid
Explanation
Solution: Hybrid progeny from a cross between two inbreds is known as a Single cross hybrid. The term "single cross" means the first-generation hybrid between two inbred lines. Single cross hybrid is the type of hybrid that is produced when two different inbreds are cross-pollinated, which is also known as an F1 hybrid. Each seed produced from crossing two inbreds has an array (collection) of alleles from each parent.
[#682] Dhatura is a classical example of
Correct Answer
(B) Trisomic
Explanation
Solution: Dhatura is a classical example of Trisomic. The term "trisomy" is used to describe the presence of an extra chromosome or three instead of the usual pair. Trisomic plants can be distinguished from diploids by enlarged bracts, an increased number of flowers per inflorescence, and slightly undulated margins of stipules and leaflets, and the mean number of seeds per pod is reduced compared to ordinary diploids.
[#683] Date palm is
Correct Answer
(B) Dioecious
Explanation
Solution: Date palm is Dioecious. The date palm is dioecious with male flowers deficient in functional gynoecium and female flowers deficient in functional androecium borne on separate palms. The presence of male and female flowers on the same plant, a phenomenon known as monoecy, is unusual in male date palms.
[#684] Hydroponics-is also called as
Correct Answer
(D) Soil less cultivation of plants
Explanation
Solution: Hydroponics is also called soil less cultivation of plants. Hydroponics is a type of horticulture and a subset of hydroculture that involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions in aqueous solvents. The nutrients used in hydroponic systems are different organic or inorganic sources, including fish excrement, duck manure, purchased chemical fertilizers, or artificial nutrient solutions.
[#685] The term heterosis was coined by
Correct Answer
(B) Shull (1914)
Explanation
Solution: The term heterosis was coined by Shull (1914). Heterosis, hybrid vigor, or outbreeding enhancement is the improved or increased function of any biological quality in a hybrid offspring. The term heterosis to replace the older term heterozygosis, G. H. Shull aimed to avoid limiting the term to the effects that can be explained by heterozygosity in Mendelian inheritance.