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.
Explanation:
Most of the DNA is found in the cell nucleus but a small amount of DNA can also be found in the mitochondria and it is called mitochondrial DNA. Mitochondrial DNA, unlike nuclear DNA, is inherited from the mother, while nuclear DNA is inherited from both parents.
The nuclear DNA is found within a compartmentalized area within the cell called the nucleus. Each DNA molecule must be packed very tightly and precisely. This super-packaged form of DNA is called a chromosome.
we can conclude that the correct answer is:
Answer:The location of DNA in eukaryotic cells is:Cell nucleus as nuclear DNA.Mitochondria as mitochondrial DNA.
Answer:
It's D, protons. hope this helps you :)
