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प्रश्न
What is the importance of apomixis?
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उत्तर
Winkler introduced the term “apomixis” in 1908. Apomixis is an aberrant type of sexual reproduction in which the egg or other cells linked with the egg (synergids, antipodals, etc.) grow into an embryo without fertilisation and with or without meiosis. Hybrid versions of many food and vegetable crops are widely grown. The cultivation of hybrids significantly enhanced production. One of the challenges with hybrids is that hybrid seeds must be created each year. If hybrid seeds are sown, the plants will segregate and lose their hybrid characteristics. Hybrid seed production is expensive, making hybrid seeds expensive for farmers. If these hybrids are transformed into apomicts, there is no character segregation in the hybrid progeny. Farmers can then continue to use hybrid seeds to grow new crops year after year, minimising the need to purchase hybrid seeds each year. Apomixis embryos are normally infection-free.
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संबंधित प्रश्न
What is apomixis?
Are pollination and fertilization necessary in apomixis?
In ______a diploid sporophyte cell produces a diploid gametophyte without undergoing meiosis.
Identify the CORRECT statements with respect to non-recurrent apomixis.
i. Plants produced by this method are generally sterile and do not reproduce sexually.
ii. In this, megaspore mother cell undergoes usual meiotic division and a haploid embryo sac is formed.
______ refers to the formation of seeds without fertilization.
Identify the CORRECT term which describes the following condition.
In some plants, the female gamete develops into embryo without fertilization.
Adventive embryony can be observed in ______.
The phenomenon observed in some plants wherein parts of the sexual apparatus are used for forming embryos without fertilization is called ______.
A form of asexual reproduction that mimics sexual reproduction is ______.
Are pollination and fertilization necessary in apomixis? Give reasons.
Are parthenocarpy and apomixis different phenomena? Discuss their benefits.
Assertion: Apomictic embryos are genetically identical to the parent plant.
Reason: Apomixis is the production of seeds without fertilization.
Apospory is the direct formation of ______.
Which of the following defines apomixis correctly?
- Production of the embryo from an unfertilised egg.
- Production of seed without syngamy.
- Production of fruit without fertilisation.
- Production of seed without meiosis.
- Production of seed without mitosis.
Choose the correct options.
Haploid cells belong to ______.
Explain following term:
Apomixis
