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[A]: Cenromere is the primary constricti...

[A]: Cenromere is the primary constriction on the metaphase chromosome.
[R]: It hE:lps to separate sister chromatids

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
B
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The two chromatids of a metaphase chromosome represent

In disjunction (separation) of sister chromatids at anaphase

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

[A]: Chromatid is one of a pair of replicated chromosomes found during the prophase and metaphase stages of mitosis and meio- sis. [R]: Chromatin is classified as euchromatin or heterochromatin on the basis of stain-ing properties. Euchromatin is thqught to be ac- tively involved in transcription and, therefore, protein synthesis, while heterochromatin is inactive.

The separation of two chromatids of each chromosome at early anaphase is initiated by

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Which one is correct about Crossing over/Genetic recombination? (i) It occurs in tetrad stage. It occurs in pachytene of prophase I of meiosis I. (ii) It occurs between non-sister chromatids of homologous chromosomes. (iii) It is recombinase enzyme mediated process. (iv) It is also the reciprocal transfer of genes between the non homologous chromosomes.

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TRUEMAN BIOLOGY-Genetics-ASSERTION AND REASON
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  4. [A]: Dolly, a sheep is an example of cloning. [R]: Cloning in anoth...

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  6. [A]: Cycads were prevalent during Jurassic period. [R]: Jurassic pe...

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  7. [A]: Evolution is descent with modification. [R]: Evolution is der...

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  11. [A]: According to Hardy-Weinburg law both gene frequencies and genotyp...

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  12. [A]: 'Ontogeny recapitulates phylogeny' was the concept put forward by...

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  13. [A]: Vestigeal organs are those parts of the body which are greatly re...

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  16. [A]: Convergent evolution leads to production of analogous similaritie...

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  17. [A]: Heritable changes are also called mutations. [R]: Mutations ...

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  18. [A]: Homologous organs have similar structure but different functions....

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  20. [A]: During evolution of Primates, various groups diverged in a partic...

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