Why does asexual reproduction produce offsprings that are genetically identical to the parent? Class 9
Why does asexual reproduction produce offsprings that are genetically identical to the parent? Class 9
Question 1.
Why does asexual reproduction produce offsprings that are genetically identical to the parent? Class 9
Answer:
Asexual reproduction produces genetically identical offspring because it involves only one parent and no fusion of gametes. The central process of asexual reproduction is mitosis - a type of cell division in which the parent cell divides to produce two daughter cells, each having the exact same number and type of chromosomes as the parent cell. Since there is no mixing of genetic material from two different individuals, all the genetic information in the offspring is identical to that of the parent. Such offspring are called clones. This is why asexual reproduction always produces genetically identical individuals.
Question 2.
Explain why the menstrual cycle stops during pregnancy. Class 9
Answer:
Because the uterus lining is needed to nourish the developing embryo.
Explanation:
- The menstrual cycle occurs when an egg is not fertilised — the thickened uterus lining sheds as it is no longer needed.
- However, during pregnancy, the egg has been successfully fertilised by a sperm, forming a zygote.
- The zygote implants into the thick inner lining of the uterus to receive nourishment for development.
- Since the uterus lining is now being used to support and nourish the developing embryo, it does not shed.
- Therefore the menstrual cycle stops completely during pregnancy.