18. If each cell of the spore tetrad contains 4 chromosomes, how many pachytene tetrads are found in the meiocyte of that plant? 2) 8 3) 4 1) 2 4) 16
Answers
Explanation:
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Answer:
The correct answer is option (3) 4
If each cell of the spore tetrad contains 4 chromosomes, 4 pachytene tetrads are found in the meiocyte of that plant
Explanation:
Sporetetrads in Meiosis has 4 haploid spores. Each spore has 4 chromosome.
Meiocyte has Diploid chromosome which undergo meiosis to become diploid.
Haploid n =4
Diploid 2n = 4 × 2 = 8 Chromosome
Therefore, normal meiocyte of plant has 8 chromosome.
The two stages in Meiosis are Meiosis I and Meiosis II
The stages in Meiosis I are
Prophase , Metaphase, Anaphase and Telophase
The Stages of Phrophase I are
- Leptotene - In this stage the chromosome is visible under light microscope.
- Zygotene - Pairing of father and mother chromosome and forms bivalent
- Pachytene - Bivalent chromosome forms tetrahedral and clearly visible in microscope.
- Diplotene
- Diakinesis
Each chromosome has chromatids.
2 chromosome has 4 chromatids (tetrads)
In meiocyte plant has 8 chromosome, in pachytene tetrads has 4 chomosome based on pairing.
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