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fill in the blanks from the followin g word:Bivalent,synapsis,tetrad,dyad,non-sister chromatids, sister chromatids,disjuction,chiasmata,anneaking.
(a)The pairing of homologous chromosoms during zygotene stage of prophase of meiosis-I is termed___
(b)The two visible chromatids of a chromosome during pachytene of meiosis-I is termed___
(c)A group of four homologous chromatids (two dyads)is termed as____
(d)The two chromatids of two homologous chromosomes(bivalent)are termed as____
(e)The separation of homologous chromosomes during diplotene stage is called____

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The correct Answer is:
(a)Synapsis(b)dyad(c)tetrad(d)non-sister chromatids(e)disjunction.
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Assertion : Crossing over take place during pachytene stage. Reason : It is a process of interchange of chromatid material between non sister chromatid of homologous chromosomes.

Each pachytene tetrad in prophase -I is made up of (A) Four homologous chromosomes (B) Four non homologous chromosomes (c) Two homologous and two non-homologous chromosomes (D) Two homologous chromosomes

[A] : Crossing over takes place during pachytene stage . [R] : It is a process of inter change of chromatin material between one sister chromatid of each homologous chromosome .

The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed

$ The two strands of a chromosome are called sister chromatids ! The two sister chromatids get separated during Anaphase.

Write true or false for the following. Crossing over is the exchange off genetic material between two non-sister chromatids of homologous chromosome.

Identify the meiotic sage in which the homologous chromosomes separate while the sister chromatids remain associated at their centrometres. Or In which stage of meiosis homologous chromosomes are segregated

Which of the following is correct about bivalent? (i) Bivalents are tetrads. (ii) A bivalent means 4 chromatids and 2 centromeres. (iii) One bivalent consists of 2 homologous chromosomes. (iv) Bivalents form in zygotene.

PRADEEP-CELL CYCLE AND CELL DIVISION -ANALYTICAL QUESTIONS WITH ANSWERS
  1. What are mitogens? Cite atleast two examples.

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  2. what is interkinesis?

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  3. What is meant by the term congression in cell division?

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  4. Name atleast two flowers where polyploid varieties are common.

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  5. How does meiosis help in evolution?

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  6. How would you define cance? What is the technical term used for substa...

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  7. Give difference in the attachment of chromosomes to the spindle fibres...

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  8. What are tractile fibres?

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  9. Why is it not possible to shorten the cell cycle?

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  10. Why do the chromosomes become short and thick in prophase?

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  11. (a)What is meant by cell cycle?(b)In context of cell cycle,what is mea...

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  12. What happens during interphase?What is its duration.It iks divisible i...

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  13. (a)Why is mitosis also known as the equational division? (b)you are vi...

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  14. (a)In which is animal cytokinesis different from plant cytokinesis? (b...

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  15. (a)Differentiate between intranuclear and extranuclear mitosis.In whic...

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  16. (a)How many divisions take place in meiosis?How many times ,the chromo...

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  17. Study the following diagrams(depicting behaviour of chromosomes in mei...

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  18. fill in the blanks from the followin g word:Bivalent,synapsis,tetrad,d...

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  19. (a)What is the significance of meiosis-I? (b)Why meiosis-II is necessa...

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  20. Name the chemical which is used by plant breeders to induce polypoidy....

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