Homologous chromosomes pair up and exchange segments of DNA.
Option A
<h3><u>Explanation:</u></h3>
Crossing over is an event of Prophase 1 of meiosis 1. It occurs in the zygotene phase of prophase 1. Here the homologous chromosome pairs get very close together and gets packed within protein coat. The enzymes randomly cut the DNA segments from both chromosomes at same loci and exchange them with each other. This results in the exchange of genes between the two chromosomes. This is how the variation comes to place between offsprings of the same individuals. The crossing over results to form X shaped intersections between homologous pair of chromosomes which is called as chaismata. This phase occurs in pachytene phase and is visible in diplotene phase when the protein coat dissolves.
Answer:
Synthesize new drugs expand the world’s food production.
Explanation:
Green revolution was started in the 1960's with the main aim to increase the food production by 60-70% to feed the increasing population. The food grains especially rice and wheat.
The green revolution can be more beneficial by applying the benefits of the genetics. The discovery of the new drug or improvement in the earlier food products or the introduction of the desired drug protein in the food can improve the health of the organisms.
Thus, the correct answer is option (C).
Animal plays important role in angiosperm reproduction either by visiting flowers for the process of pollination or eating fruits which aids in continuation of generation
