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प्रश्न
Explain how, in sexually reproducing organisms, the number of chromosomes in the progeny is maintained.
उत्तर
In sexually reproducing organisms, the gametes undergo meiosis, and hence, each gamete contains only half a set of chromosomes. When two gametes fuse, the zygote formed contains the full set of chromosomes. Hence, the formation of gametes by meiosis helps to maintain the number of chromosomes in the progeny.
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संबंधित प्रश्न
What are chromosomes?
A zygote is formed as a result of fertilisation.
Name the male and female gametes in animals.
Name the organ involved in the following:
Fertilisation of ovum by tile sperm.
Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.
What are seasonal breeders? Give an example.
Answer in one sentence.
Name the endocrine glands involved in maintaining the sex characteristics of males.
Due to presence of which of the following chemical component, pollen grains can remain well preserved in fossil?
Justify the statement ‘Vegetative reproduction is also a type of asexual reproduction’.
Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
Both these plants - rose and tomato - both selected by human beings for different characteristics, the rose for its flower and tomato for its fruit. Roses, being vegetatively propagated do not need to produce seeds.
