Sexual Reproduction in Animals
Sexual reproduction in animals is the integrated processes of meiosis, mitosis, and fertilization. Gamete is formed after meiosis in male and female reproductive cells. This note explains how sexual reproduction occurs in animals.
Summary
Sexual reproduction in animals is the integrated processes of meiosis, mitosis, and fertilization. Gamete is formed after meiosis in male and female reproductive cells. This note explains how sexual reproduction occurs in animals.
Things to Remember
- Sexual reproduction in animals is the integrated processes of meiosis, mitosis, and fertilization.
- Male gamete are micro gamete whereas female gamete are mega gamete.
- Gamete is formed after meiosis in male and female reproductive cells.
- Zygote is formed after the fusion of male and female gamete.
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What is correspondence?
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What is correspondence? Explain its importance.
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State any two objectives of correspondence.
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Sexual Reproduction in Animals
Definitions
- Hermaphrodites: Those animals that contain both male and female reproductive organs in the same individual are called hermaphrodites.
- Fertilization: The process of fusion of male and female gamete is called fertilization.
- Internal fertilization: Fertilization, the process of fusion of male and female gamete, which takes place inside the female body, is called internal fertilization. It occurs in higher vertebrates. It is safer and no watery medium is required.
- External fertilization: Fertilization, the process of fusion of male and female gamete, which takes place out of the female body, is called external fertilization. It occurs in lower vertebrates. For this fertilization to occur water medium is required and it is not safe.
Procedure of sexual reproduction in animals
After meiosis, the male reproductive system produces sperm (male gamete) and the female reproductive system produces egg (female gamete). Then male releases its gamete that fuses with female gamete. The fusion may be internal (in higher organisms) or external (in lower organisms). If it is external then a medium, that carries male gamete, is required and mostly it is water. After fertilization, the egg becomes zygote and undergoes mitosis to become an embryo. Embryo again with the help of mitosis becomes a new individual.
Difference between male and female gamete:
Male gamete | Female gamete |
1. It is also called microgamete, as it is smaller than female gamete. | 1. It is also called mega gamete, as it is larger than male gamete. |
2. It is motile as it can swim with the help of flagella. | 2. It is immotile. |
3. It is produced after meiosis in male reproductive cells. | 3. It is produced after meiosis in female reproductive cells. |
Difference between gamete and Zygote
Gamete | Zygote |
1. It is formed after meiosis in male and female reproductive cells. | 1. It is formed after the fusion of male and female gamete. |
2. It contains haploid number of chromosome. | 2. It contains diploid number of chromosome. |
3. Gamete does not divide further. | 3. Zygote does divide further and give embryo. |
Lesson
Reproduction
Subject
Science
Grade
Grade 10
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