Genetics And Plant Breeding - Study Mode

[#471] From one megaspore mother cell number of megaspore finally produced is
Correct Answer

(C) 4

Explanation

Solution: From one megaspore mother cell number of megaspores finally produced is 4. Megaspores are a type of spore that is present in heterosporous plants. The megaspore, or large spore, germinates into a female gametophyte, which produces egg cells. During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells.

[#472] The pathway of carbon in photosynthesis was discovered by
Correct Answer

(D) Calvin

Explanation

Solution: The pathway of carbon in photosynthesis was discovered by Calvin. Calvin shone a light on the lollipop and used a radioactive form of carbon called carbon-14 to trace the path that carbon took through the algae's chloroplast, the part of the cell where photosynthesis occurs. By this method, he discovered the steps plants use to make sugar out of carbon dioxide.

[#473] Recurrent selection is mostly used in
Correct Answer

(B) Cross-pollinated crops

Explanation

Solution: Recurrent selection is mostly used in Cross-pollinated crops. Recurrent selection means repeated cycles of selection and breeding aimed at the gradual genetic improvement of a few key traits in a single species. The benefits of breeding are cumulative in that each cycle or generation of improvement builds upon advances made in prior generations. The recurrent selection was originally developed as a method of breeding in cross pollinated species. However, it is more commonly used in cross pollinated species than in self pollinated species.

[#474] A heterogonous population includes
Correct Answer

(D) All of the above

Explanation

Solution: A heterogonous population includes Landraces, Multilines, and Synthetics and composites. It is one in which a large degree of variation can be observed in traits. And this type of population is quite common in real life. A heterogeneous population or sample is one where every member has a different value for any characteristic. For example, if everyone in your group varied between 4'3″ and 7'6″ tall, they would be heterogeneous in height.

[#475] A common crop of natural autopolyploid grown which is
Correct Answer

(C) Potato

Explanation

Solution: A common crop of natural autopolyploid grown is Potato. Polyploidy is a condition in which the cells of an organism have more than one pair of (homologous) chromosomes. Autopolyploids are polyploids with multiple chromosome sets derived from a single taxon. Autopolyploids possess at least three homologous chromosome sets, which can lead to high rates of multivalent pairing during meiosis (particularly in recently formed autopolyploids, also known as neopolyploids) and an associated decrease in fertility due to the production of aneuploid gametes.