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Embryo sacs of some apomitic species app...

Embryo sacs of some apomitic species appear normal but contain diploid cells. Suggest a suitable explanation for the condition.

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It is true that many apomicts possess normal looking embryo sacs. The only possibility of the embryo sac possessing diploid cells is due to failure of meiotic division at the megaspore mother cell stage. Since the megaspore mother cell has a diploid nucleus, if it undergoes mitosis instead of meiosis all the resulting nuclei and cells will be diploid in nature.
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TRUEMAN BIOLOGY-REPRODUCTION-SECTION-D
  1. When and where in the body is oogenesis completed?

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  2. (a) How is the placenta connected to the embryo? (b ) Placenta acts ...

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  3. Give reasons why: (i) Most zygotes in angiosperms divide only afte...

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  4. 2 difference between cross pollination and self pollination

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  5. Draw a labelled diagram of the structure of mature dicot embryo.

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  6. (a ) Draw a labelled longisectional view of an albuminous 'seed'·

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  7. Describe the post-zygotic events leading to implantation and placenta ...

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  8. Although sexual reproduction is a long drawn, energy-intensive complex...

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  9. Embryo sacs of some apomitic species appear normal but contain diploid...

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  10. Meiotic division during oogenesis is different from that in spermatoge...

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  11. Enumerate and describe any five reasons for introducing sex education ...

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  12. The following is the illustration of the sequence of ovarian events (a...

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  13. Describe the stage in embryo development in a dicot plant.

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  14. Where is morula formed in humans? Explain the process of its developme...

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  15. Mention the fate of all the components of the embryo sac after fertili...

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  16. (a) Draw a diagrammatic sectional view of a mature anatropous ovule an...

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  17. (a) Draw a diagrammatic sectional view of the female reproductive syst...

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  18. (a) Draw a labelled schematic diagram of the transverse section of a m...

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  19. Write two differences between spermtogenesis and oogenesis

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  20. (a) Draw a diagram of a mature embryo sac of an angiosperm and label t...

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