CELL DIVISION
MEIOSIS AND GENETIC VARIATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
1
|
|
|
2
|
|
|
3
|
|
|
4
|
Detailed explanation-1: -In human females, the process that produces mature eggs is called oogenesis . Just one egg is produced from the four haploid cells that result from meiosis.
Detailed explanation-2: -In women, only one of the four sex cells becomes an egg cell that can be fertilized. During meiosis, it receives most of the cell body of the parent cell. The three smaller cells – referred to as polar bodies – break down and disappear. If a sperm cell fertilizes an egg cell, the nuclei of the two cells combine.
Detailed explanation-3: -Telophase II: During telophase II, cell division begins again in each of the two daughter cells, creating 4 daughter cells. Each of these 4 daughter cells contains 23 chromosomes, making them haploid, and none of the 4 is exactly alike (due to crossing over and independent assortment).
Detailed explanation-4: -Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells.
Detailed explanation-5: -Therefore, meiosis results in four haploid genetically unique daughter cells, each with half the DNA of the parent cell (Figure below). In human cells, the parent cell has 46 chromosomes (23 pairs), so the cells produced by meiosis have 23 chromosomes.