University:
Camosun College
Course:
BIOL 252 | Pathophysiology for Nursing 1
Academic year:

2022
Views:

391

Pages:

3
Author:

levedzgetmo7f

Meiosis Chromosome Number For Questions 1–8, write True if the statement is true. If the statement is false, change the underlined word to make the statement true. true 1. The offspring of two parents obtains a single copy of every gene from each parent. true 2. A gamete must contain one complete set of genes. False 3. Genes are located at specific positions on spindles. False 4. A pair of corresponding chromosomes is homozygous. false 5. One member of each homologous chromosome pair comes from each gene. false 6. A cell that contains both sets of homologous chromosomes is haploid. true 7. The gametes of sexually reproducing organisms are haploid. false 8. If an organism’s haploid number is 6, its diploid number is 3. Phases of Meiosis On the lines provided, identify the stage of meiosis I or meiosis II in which the event described occurs. Phophase I 9. Each replicated chromosome pairs with its corresponding homologous chromosome. Prophase I 10. Crossing-over occurs between tetrads. Metaphase I 11. Paired homologous chromosomes line up across the center of the cell. Anaphase I 12. Spindle fibers pull each homologous chromosome pair toward an opposite end of the cell. Telophase I 13. A nuclear membrane forms around each cluster of chromosomes and cytokinesis follows, forming two new cells. Prophase II 14. Chromosomes consist of two chromatids, but they do not pair to form tetrads. Telophase II 15. A nuclear membrane forms around each cluster of chromosomes and cytokinesis follows, forming four new cells. Identify each phase of meiosis shown in the diagrams below. 16. __prophase I____________. 17. metaphase I 20.Anaphase II 19. metaphase II 22. __Telophase II______________ 18. ____Anaphase I_____________ 21. Metaphase II 23. __ metaphase II______________ Use this picture to answer Questions 18–20. 24. What does the diagram show? Crossover between a pair of homologous chromosomes 25. During what phase of meiosis does this process occur? It occurs during prophase 1 of meiosis 26. What is the result of this process? The result is a new combination of alleles Comparing Meiosis and Mitosis 27. Complete the table to compare meiosis and mitosis. Mitosis Form of reproduction Meiosis First stage in sexual Asexual 4 Number of daughter cells 2 Cut in half to haploid Change in chromosome number No change stays as a diploid 2 Number of cell divisions Number of difference in alleles between parent cell and daughter cells 1 none Each of the four daughter cells is genetically different from the parent For Questions 28–33, complete each statement by writing the correct word or words. 28. A diploid cell that enters mitosis with 16 chromosomes will divide to produce cells. Each of these daughter cells will have 16 chromosomes. 2 daughter 29. If the diploid number of chromosomes for an organism is 16, each daughter cell after mitosis chromosomes. will contain 16 30. A diploid cell that enters meiosis with 16 chromosomes will pass through 2 cell divisions, producing 4 daughter cells, each with 8 chromosomes. 31. Gametes have a haploid number of chromosomes. 32. If an organism’s haploid number is 5, its diploid number is 10 . 33. While a haploid number of chromosomes may be even or odd, a diploid number is always even .