Which of the following cell division types reduces the chromosome number? A. Mit

Question

Which of the following cell division types reduces the chromosome number? A. Mitosis B. Meiosis I C. Meiosis II D. Cell cycle Identify synapsis during prophase I from the following: A Physical exchange of genetic material B Pairing of homologous chromosomes C. No movement of chromosomes D. Formation of cross What happens during crossing over? A. Physical exchange of genetic material B. Pairing of homologues C. No movement of chromosomes D. Formation of cross What is the name the "physical cross" that non-sister chromatids of the homologous chromosomes make during prophase I? A. Synapsis B Spindle C. Chiasmata D. Equatorial plate "Chromosomes pairs" line up at equator during: A Prophase I B. Metaphase I C. Anaphase II D Metaphase II A woman conceives at the age of 32. How old is her ovum (egg) at the time? A. 1-3 days B 14 days C. 28 days D. 32 years Identify process of translation (arrow means synthesis): A Protein rightarrow RNA B. RNA rightarrow Protein C. RNA rightarrow DNA D. Protein rightarrow DNA What does Mendel's first law of segregation state? A Allele (chromosomes) pairs separate during gamete formation B. Allele (chromosomes) pairs separate as if no other pairs are present during gamete formation C. Dominant allele dominates over the receives one D. Pairing fails What does Mendel's second law of Independent Assortment state? A. Allele (chromosomes) pairs separate during gamete formation B. Allele (chromosomal) pairs separate as if

Explanation / Answer

ANS 16) The cell division that reduce the chromosome number is B) Meiosis 1.

During the anaphase 1 homologous chromosome are separated and moves towards the opposite poles and the number of the chromosome is half the diploid number in each daughter cell.

Ans 17) Synapsis during prophase 1 is B) Pairing of homologous chromosome.

The synapsis occur in the Zygotene sub stage of meiosis 1.

Ans 18) During the crossing over the A ) The physical exchange of genetic material occur.

Crossing over takes place in the Pachytene sub stage of meiosis 1. It is a physical exchange between the non-sister chromatid in a pair of homologous chromosome. The exchange is a process of breaking and rejoining of two chromatids.

Ans 19) C) Chiasmata is the name " physical cross " that non-sister chromatid of homologous chromosome makes during prophase 1.

The option A) Synapsis is incorrect. This means pairing of homologous chromosome.

Option B) Spindle is incorrect because it is a cellular structure that help in cell division.

Option D) Equatorial plate is incorrect because equatotial plate means an arrangement of the centromeres of chromosome in which they lie approximately in one plane at the equator of the spindle. It is observed at the metaphase of Mitosis and meiosis.

Ans 22) The translation means conversion of RNA into Protein through the help of ribosomes. So the option B is the correct answer.

  

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