18. Plants undergo an alternation of generations in which a ___________ sporophyte produces haploid ___________ by meiosis, and a ___________ gametophyte produces haploid___________ by mitosis. (haploid, diploid, gametes, spores, gametophyte or sporophyte) Correction at time stamp 24:07 "These two cells," should be "These two chromosomes," 19. During anaphase I, ___________ separate; during anaphase II, ___________ separate. 20. Homologous chromosomes undergo crossing-over during ___________ (phase). 21. The sites of crossing-over are called ___________ PART 2: 22. During meiosis I, recombination occurs during ___________, and the homologous chromosomes separate during ___________ 23. During anaphase II, the ___________ separate. 24. During prophase I, a pair of homologous chromosomes will pair up. They are held together for synapsis by the ___________ complex. In that arrangement, crossing over of the non-sister chromatids of the homologs can occur. The result is ___________ 25. Compare the products of mitosis and meiosis (# of nuclei formed; diploid or haploid; identical or unique) Mitosis forms ___________ nuclei, which are genetically ___________ to each other. Meiosis forms ___________ nuclei, which are genetically ___________ to each other. (choices: 2, 4, diploid, haploid, identical, unique) 26. The original source of genetic diversity (or variation) is the formation of___________ 27. Alleles are different versions of the same ___________ 28. In humans, the average number of cross-over events in one chromosome is ___________
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Step 1: The first part of the question states that plants undergo an alternation of generations in which the sporophyte produces haploid **spores** by meiosis, and the gametophyte produces haploid **gametes** by mitosis. Show more…
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Meiosis I separates homologous chromosomes, each of which comes from one parent and contributes to genetic variation via the law of independent assortment and via crossing over. Cells at the beginning of meiosis I are diploid and cells at the end of meiosis I are haploid. In contrast, meiosis II separates sister chromatids, each of which started out as a single chromosome. Cells at the beginning of meiosis II are haploid and at the end of meiosis II are diploid. This process contributes to genetic variation by creating gametes that are subject to random fertilization, independent assortment, and crossing over.
Madhur L.
Complete the following sentences: metaphase of mitosis, prophase II of meiosis, crossing over, anaphase I of meiosis, variable, random fertilization, identical, random orientation, metaphase I of meiosis, prophase I of meiosis, metaphase II of meiosis, reduction division Two processes that occur during meiosis produce genetically identical cells. In a process called random orientation, paired homologous chromosomes align randomly at the cell equator. This occurs during metaphase I of meiosis. In a process called crossing over, genetic material is exchanged between homologous chromosomes. This occurs during prophase I of meiosis. -Complete the following paragraph to describe nondisjunction and the resulting effects on chromosome number. words: euploidy, primary nondisjunction, normal, nondisjunction, secondary nondisjunction, homologous chromosomes, abnormal, trisomy, monosomy, sister chromatids, aneuploid 1.During meiosis I, homologous chromosomes separate and move towards opposite ends of the poles. 2.During meiosis II, sister chromatids separate and move towards opposite ends of the poles. 3.During meiosis I, if both members of a homologous pair go into the same daughter cell, primary nondisjunction is said to occur and no normal gametes are produced. 4.During meiosis II, if the sister chromatids fail to separate and both daughter chromosomes go into the same gamete, secondary nondisjunction is said to occur. Half the gametes are aneuploid while the other half are euploid. 5.If an egg that contains 24 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, trisomy is said to have occurred. 6.If an egg that contains 22 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, monosomy is said to have occurred.
Adi S.
Indicate the stage of meiosis (e.g. metaphase 2 = M2; prophase 1 = P1; anaphase 2 = A2; etc.) in which each of the following events occurs: 1. first cell stage in which the original maternal/paternal chromatid doublets (chromosomes) are in separate cells 2. chromosomes (chromatid doublets) first synapse (tetrads are visible) 3. chromosomes (chromatid doublets, but NOT tetrads) line up in single file one doublet next to the other 4. crossing over and recombination occurs 5. chromatid doublets move toward opposite poles of cell 6. chromosomes (DNA) replicate 7. chromatids separate as centromeres divide 8. chromosomes (chromatid doublets) line up as tetrads at the cell's equator The number of chromosomes found in the sperm cell of a sunflower is 17. Give the amount of chromosomes to the following: a. Egg cell of a sunflower 17 b. Fertilized egg of a sunflower 34 c. Body cell of the sunflower 17 9. Prophase and telophase are considered opposite stages. Highlight the answer in the table below: Mitotic Spindle | Nuclear Envelope | Chromosomes Prophase Appear Disappear | Appear Disappear | Condense Relax Telophase Appear Disappear | Appear Disappear | Condense Relax
Suman K.
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