. Mention the different stages of sexual reproduction.
Answers
Answered by
14
Please find below the solution to the asked query.
The three stages of sexual reproduction are:
1. Pre-fertilisation: These include all preparatory events which occur in the organism before fusion of gametes.
They are gametogenesis and gamete transfer.
During gametogenesis Two kinds of specialised cells called gamete (female gamete -ovum /egg and male gamete-sperm) are formed.
Gamete transfer involves transfer of male gamete to near female gamete for fertilization. The male gametes are mostly small and motile, so that can reach to the female gamete easily. Female gametes are large, non motile and store food to nourish embryo.
2. Fertilsation: Fertilization is the fusion of the male and the female gametes with each other to give rise to a single-celled zygote. The zygote then undergoes repeated divisions to give rise to a new individual.
3. Post-fertilsation: This include formation of zygote followed by development of embryo i.e embryogenesis.
Zygote is the diploid cell formed by the fusion of male and female gametes during fertilization in sexual reproduction. Zygote is the first stage in the development process of an organism and it contains all the genetic information essential for the growth of the new organism.
Embryogenesis is the process of development of zygote into an embryo. It is more often involves only mitosis. It may occur outside the body of parent organism, as in oviparous animals.
The zygote undergoes rapid mitotic divisions with no significant growth and cellular differentiation, leading to development of an embryo.
Because of cell division, cluster of cells formed in the same size as the original zygote. This process is known as cleavage .
After the 7th cleavage it becomes 128 cells and now the embryo is called as blastula.
Then the germ layers started its formation. They are the ectoderm, mesoderm and endoderm. Cells migrate to the interior of the blastula, as a consequence forming two or three germ layers.
Now the embryo is known as gastrula. The diploblastic animals have the ectoderm and the endoderm and the triploblastic animals have all the three germ layers.
Then the organogenesis begins.
Organs arise at this time like kidney, heart and etc. But after this the development would be different for different organisms.
At end of embryonic development, the fully grown embryo would be formed.
Hope this information will clear your doubts about the topic.
CHEERS !!!!!
The three stages of sexual reproduction are:
1. Pre-fertilisation: These include all preparatory events which occur in the organism before fusion of gametes.
They are gametogenesis and gamete transfer.
During gametogenesis Two kinds of specialised cells called gamete (female gamete -ovum /egg and male gamete-sperm) are formed.
Gamete transfer involves transfer of male gamete to near female gamete for fertilization. The male gametes are mostly small and motile, so that can reach to the female gamete easily. Female gametes are large, non motile and store food to nourish embryo.
2. Fertilsation: Fertilization is the fusion of the male and the female gametes with each other to give rise to a single-celled zygote. The zygote then undergoes repeated divisions to give rise to a new individual.
3. Post-fertilsation: This include formation of zygote followed by development of embryo i.e embryogenesis.
Zygote is the diploid cell formed by the fusion of male and female gametes during fertilization in sexual reproduction. Zygote is the first stage in the development process of an organism and it contains all the genetic information essential for the growth of the new organism.
Embryogenesis is the process of development of zygote into an embryo. It is more often involves only mitosis. It may occur outside the body of parent organism, as in oviparous animals.
The zygote undergoes rapid mitotic divisions with no significant growth and cellular differentiation, leading to development of an embryo.
Because of cell division, cluster of cells formed in the same size as the original zygote. This process is known as cleavage .
After the 7th cleavage it becomes 128 cells and now the embryo is called as blastula.
Then the germ layers started its formation. They are the ectoderm, mesoderm and endoderm. Cells migrate to the interior of the blastula, as a consequence forming two or three germ layers.
Now the embryo is known as gastrula. The diploblastic animals have the ectoderm and the endoderm and the triploblastic animals have all the three germ layers.
Then the organogenesis begins.
Organs arise at this time like kidney, heart and etc. But after this the development would be different for different organisms.
At end of embryonic development, the fully grown embryo would be formed.
Hope this information will clear your doubts about the topic.
CHEERS !!!!!
Answered by
1
Sexual reproduction consists of a set of events and can be divided into three stages: Pre-fertilization, Fertilization, and Post-fertilization.
Hope it's helpful dear_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Similar questions