Answer:
Explanation:
Meiosis is a form of cell division that occurs in the sex cells of organisms. It ensures the reduction of a diploid cell to an haploid cell to allow for the formation of a diploid zygote after fertilization (contribution of both parents haploid sex cells to give a diploid zygote). Thus, this process is very essential and important.
The reduction is accomplished by 2 divisions after the duplication of chromosomes
- first division: separation of homologous pairs of chromosomes (this reduces the total in half)
- second division: separation of sister chromatids of a chromosome.
The rearrangement in meiosis occurs by crossing over/genetic recombination.
This is the exchange of genetic material between homologous pairs of chromosome bringing about a rearrangement and genetic variation
An example of a chromosomal abnormality that arises as a result of defects in this process is the Down Syndrome which is caused by a nondisjunction of the chromosomes 21 pair in a sex cell.
This condition produces offsprings that have some characteristic facial features, short stature etc
Answer and Explanation:
It's a constrictive growth pyramid I think. They could die out in the future..
I can't remember the factors that have led to the growth
Answer:
The correct answer is b. prokaryotes store their genetic information in a nucleus
Explanation:
Prokaryotes are organisms that do not have a true nucleus. A true nucleus is an organelle that is membrane-bound and contains the cell's genetic material inside it.
In prokaryotes nucleus is not present do its genetic material is spread in the cytoplasm of the cell. Bacteria and archaea are considered to come under the prokaryotes group because they do not have a membrane-bound nucleus and other organelle.
Eukaryotes are the organisms that have membrane-bound nucleus and they store their genetic information in the nucleus. Therefore the correct answer is b. prokaryotes store their genetic information in a nucleus.
