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:
villi/microvilli
Explanation:
the villi absorb nutrients in your small intestine, microvilli increase surface area so nutrients are taken in more quickly
Hey There
Correct answer: <span>During the second and third trimesters of pregnancy, a daily increase of <span>healthy </span>calories is recommended
Why? Because you need more food to help the baby grow, you are eating for two people
Have a good day</span>
