Advertisements
Advertisements
प्रश्न
What would be the effect if meiosis did not occur in nature?
Advertisements
उत्तर
- During meiosis, reduction division produces four haploid cells (gametes i.e. human sperm cell and egg cell) from a single diploid cell. Hence, if meiosis does not occur, it will result in a doubling of chromosomes in each successive generation, which will result in the formation of abnormalities.
- If meiosis does not occur, the chromosome number of parents and their offsprings will differ in every generation, hence no species will hold its characters.
- Also, there will be no crossing over of homologous chromosomes. Thus, there will be no variations with respect to the changing environment in progeny to maintain their existence, which may lead to the extinction of species.
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true (T) or false (F):
A fertilised egg becomes a seed.
State whether the following statement is true (T) or false (F):
The plumule of an embryo gives rise to the root system.
Define the term Gamete.
Name the following:
Fusion of sperm and ovum.
The following diagram represents the vertical sectional view of the human female reproductive system.
How does the uterus prepare for the reception of zygote?
Name two essential structures which take part in fertilization.
How is the fetus protected?
Draw a labeled diagram of sperm.
Name the Following
The basic unit of the testes.
Complete the following sentences with appropriate word:
___________ hormones are secreted by the interstitial cells.
Complete the following sentences with appropriate word:
Fertilization of the human egg by the sperm normally occurs in the_______
Complete the following sentences with appropriate word:
The process of releasing an egg from the ovary is called _________.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Sperm is a highly motile male gamete.
Explain the mechanism of fertilization in humans.
How many hours are required for the process of capacitation?
What are autosomes chromosomes?
Explain tubectomy and vasectomy.
Fertilization takes place in ______.
