Genetics And Plant Breeding - Study Mode
[#671] Reversion occurs due to
Correct Answer
(B) Mutation
Explanation
Solution: Reversion occurs due to Mutation. Reversions are genetic alterations that reverse the effect of mutations. It refers specifically to phenotype. Rarely, the original base sequence is restored. These are called true revertants. Reversion occurs when the effects of one mutation are counteracted by a second mutation.
[#672] Crossing over occurs in
Correct Answer
(C) Four stranded stage
Explanation
Solution: Crossing over occurs in Four stranded stage. Chromosomal crossover , or crossing over , is the exchange of genetic material during sexual reproduction between two homologous chromosomes' non-sister chromatids that results in recombinant chromosomes. Crossing over takes place between two chromosomes when they are in the four-stranded stage, two each.
[#673] Which of the following is the maize + wheat research institute?
Correct Answer
(D) CIMMYT
Explanation
Solution: CIMMYT is the maize + wheat research institute. CIMMYT stands for International Maize and Wheat Improvement Center. It works throughout the developing world to improve livelihoods and foster more productive sustainable maize and wheat farming. It targets critical challenges, including food insecurity and malnutrition, climate change and environmental degradation. Through collaborative research, partnerships, and training, the center helps to build and strengthen a new generation of national agricultural research and extension services in maize- and wheat-growing nations.
[#674] Monoecious condition is an
Correct Answer
(A) Adaptation for cross-pollination
Explanation
Solution: Monoecious condition is an adaptation for cross-pollination. Monoecious is a sexual system in seed plants where separate male and female cones or flowers are present on the same plant. It leads to cross pollination, where the pollens of one flower fertilize with the female flower of another plant. It can prevent self-pollination in an individual flower but cannot prevent self-pollination between male and female flowers on the same plant.
[#675] The scientific name of maize is
Correct Answer
(C) Zea mays
Explanation
Solution: The scientific name of maize is Zea mays. The genus is Zea whereas the species is mays, therefore the botanical name of the maize is Zea mays. The word maize derives from the Spanish form of the indigenous Taíno word for the plant, mahiz . Using the maize's common name, Linnaeus included it as the species epithet in Zea mays . It is known by other names including "corn" in some English-speaking countries.