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[A): DNA replicates after mitosis. [R...

[A): DNA replicates after mitosis.
[R]: In mitosis, the chromosomal number does not stay constant

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

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The correct Answer is:
D
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Pick out the correct statements (A) Mitosis takes place in the somatic cells and meiosis takes place in the germ cells (B) During mitosis, the DNA replicates once for one cell division are in meiosis the DNA replicates twice for two cell divisions (C) Mitosis and meiosis occur both in sexually and asexually reproducing organisms

[A]: Meiosis II is not mitosis. [R]: Meiosis II occurs in cell with haploid chromosomes

Name the stage of mitosis in which chromosomes are arranged on the equator of spindle

[A]: The process of speciation occurs only in allopatric populations. [R]: The sympatric species can arise either due to changes in the chromosome number or due to introgressive hybridization and poly- ploidy.

[A]: DNA code is copied in the synthesis of tRNA. [R]: tRNA moves out of the nucleus and after attaching on ribosomes form the template

From the relation R=R_(0)A^(1//3) , where 'R_(0)' is a constant and 'A' is the mass number of a nucleus, show that the nuclear matter density is nearly constant.

[A]: Meselson and Stahl tested the Watson and Crick Theory of DNA replication. [R]: They confirmed the mechanism of DNA replication by using the isotopic and Centrifu- gation technique

Which one of the following combinations of chromosome number (n) and DNA content (c) is true of the diplotene stage of mammalian oocyte?

[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.

TRUEMAN BIOLOGY-Genetics-ASSERTION AND REASON
  1. [A]: Kornberg and Ochoa got Nobel Prize in the field of genetics. [...

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  2. Consider the following statements : Assertion (A) : Amber codon is a...

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  3. [A): DNA replicates after mitosis. [R]: In mitosis, the chromosomal...

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  4. [A]: DNA code is copied in the synthesis of tRNA. [R]: tRNA moves o...

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  5. Assertion : DNA is associated with proteins. Reason : DNA binds aro...

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  6. [A]: Translocation involves transfer of genetic material between homol...

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  7. Assertion : Left-handed DNA is known as B-DNA. Reason : Right - han...

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  8. [A]: Meselson and Stahl tested the Watson and Crick Theory of DNA repl...

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  9. Assertion (A) : Adenine cannot pair with cytosine. Reason ® : Becaus...

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  10. [A]: DNA is associated with proteins. [R]: DNA winds around histon...

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  11. Assertion. The genetic code is degenerate. Reason. Most amino acids ...

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  12. Assertion A non-overlapping code means that a base in mRNA is not use...

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  13. [A]: Recombinant DNA contains DNA from two or more sources. [R]: Pl...

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  14. [A]: Genetic engineering is the use of tech- nology to alter the genom...

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  15. [A]: The Lac operon is an example of induc- ible system. [R]: When L...

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  16. [A]: Vectors carry only the foreign DNA/gene into the host cell. [R]...

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  17. [A]: The series of enzyme controlled reac- tions determine traits in a...

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  18. [A]: Raphanobrassica is an excellent ex- ample of allotertraploidy. ...

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  19. [A]: Plasmids are double .stranded extra chromosomal DNA. [R]: Plas...

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  20. [A]: Adenine can not pair with cytosine. [R]: Because there would b...

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