Assertion (A): | Meiosis leads to recombinations of genes. |
Reason (R): | Crossing over occurs in pachytene sub-stage of prophase I of meiosis. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA: | Tendency of parental combinations to remain together is called crossing over. |
R: | Crossing over provides proof in favour of the linear arrangement of genes on chromosomes. |
1. | If both Assertion & Reason are true and the reason is the correct explanation of the assertion.. |
2. | If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. |
3. | If Assertion is a true statement but Reason is false.. |
4. | If both Assertion and Reason are false statements. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch each item in Column I with one item in Column II and chose your answer from the codes given below.
Column I (stage of prophase I) |
Column II (event) |
I. Zygotene II. Pachytene III. Diplotene IV. Diakinesis |
1. Crossing over 2. Chiasmata formation 3. Bivalent formation 4. Terminalization of chiasmata |
Codes:
I II III IV
1. 1 2 3 4
2. 2 1 4 3
3. 3 1 2 4
4. 3 2 1 3
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch the following column I with column II.
Column I | Column II | ||
A. | Synapsis aligns homologous chromosomes | (i) | Anaphase II |
B. | Synthesis of RNA and protein | (ii) | Zygotene |
C. | Action of enzyme recombinase | (iii) | G2 - phase |
D. | Centromeres do not separate, but chromatids move towards opposite poles | (iv) | Anaphase I |
(v) | Pachytene |
1. A-(ii), B-(i), C-(iii), D-(iv)
2. A-(ii), B-(iii), C-(v), D-(iv)
3. A-(i), B-(ii), C-(v), D-(iv)
4. A-(ii), B-(iii), C-(iv), D-(v)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyList I | List II | ||
A. | Pairing of homologous chromosomes | I. | Chiasmata |
B. | Actual interchange of segments between two homologous chromosomes | II. | Synaptonemal complex |
C. | Protein body formed between paired homologs | III. | Synapsis |
D. | The cross shaped configuration visible between homologs | IV. | Crossing over |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRead the four statements (a-d) and choose the correct option.
a. | Spindle fibers attach to kinetochores of chromosomes during metaphase. |
b. | Cell growth results in disturbing the ratio between the nucleus and the cytoplasm. |
c. | Pachytene stage is relatively short-lived compared to the leptotene. |
d. | Interkinesis is a short-lived stage characterized by duplication of DNA. |
1 a, b & c are correct
2 Only c is incorrect
3 b & d are correct
4 a & b are correct
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology