Advertisements
Advertisements
Question
Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.
Solution
Meiosis is an essential event in the sexual life cycle of any organism. It is because of the following two reasons:
- It is a source of genetic variability in the sexually reproducing organisms (due to crossing over that occurs in pachytene stage).
- It helps to conserve the chromosome number of species from generation to generation.
APPEARS IN
RELATED QUESTIONS
Complete the following table to get the differences between asexual and sexual reproduction:
| Characteristics | Asexual Reproduction | Sexual Reproduction |
| Number of parents involved | ........................... | .............................. |
| Type of cells involved | Somatic cells | Germ cells |
| Type of cell division | ............................ | Meiosis and mitosis |
What are chromosomes?
What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process? How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals?
List three distinguish features between sexual and asexual types of reproduction, in tabular form.
Define Juvenile phase,
Define Senescent phase.
Internal fertilisation occurs ______.
State the basic requirement for sexual reproduction?
Write the various steps involved in the sexual reproduction in plants.
Define the term Fetilization.
Define the term Puberty.
How is the chromosome number maintained in sexually reproducing organisms?
Answer the following question.
It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.
Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
What is parthenogenesis? Give two examples from animals
Give reason for the following:
A male honey bee has 16 chromosomes whereas a female has 32 chromosomes.
How is juvenile phase different from reproductive phase?
Due to presence of which of the following chemical component, pollen grains can remain well preserved in fossil?
______ is the first stage of sexual reproduction.
Mention two inherent characteristics of Amoeba and yeast that enable them to reproduce asexually.
Suggest a possible explanation why the seeds in a pea pod are arranged in a row, whereas those in tomato are scattered in the juicy pulp.
