what is sexual reproduction and describe the various phase of reproduction?
Answers
Answer:
Sexual reproduction: A process where two parents participate in producing their offspring. Following are the stages of reproduction:
Pre-fertilization
This stage involves the events prior to fertilization. Gamete formation (gametogenesis) and transfer of gamete are the two processes that take place during this stage. Gametes are sex cells which are haploid (23 chromosomes) in nature and are distinct in males and females. Male gamete is called sperm whereas female gamete is called ovum or egg. In every organism, these gametes are formed within special structures. Since female gamete is immobile, male gametes need to be transferred for fertilization.
In plants, this is attained by pollination. Unisexual animals transfer gametes by sexual intercourse.
Fertilization
Once the haploid male and female gametes meet and fuse together to form a zygote, this is known as fertilization or syngamy. This can occur either outside the body called external fertilization or inside the body called internal fertilization.
Post-fertilization
Fertilization results in diploid zygote formation. Eventually, the zygote divides mitotically and develops as an embryo. This process is called embryogenesis. During embryogenesis, cell differentiates and modify accordingly. Zygote development depends on the organism and its life cycle.
Oviparous and Viviparous
Animals are classified into oviparous and viviparous based on whether the zygote develops outside or inside the body respectively. In angiosperms, zygote develops into the ovary and ovary transforms into fruit while ovules develop into seeds.
This stage involves the events to fertilization gamete are the two process that take place during the stage gamete are sex cell which are haploid 23 chromosomes in presents male and female..
-> The various phase of reproduction in given below.
1. oviduct / Fallopian tube
2. Ovary
3. Uterus
4. cervix
5. vagina