Meiosis Virtual Lab Questions and Answers 100% Pass

Meiosis Virtual Lab Questions and Answers 100% Pass Which action(s) below occur both in mitosis and meiosis? - chromosomal DNA condenses. -chromosomes move within cells -cell membranes pinch apart (in both mitosis and meiosis, chromosomes condense and move, and the cells pinch apart. However, meiosis produces cells that differ chromosomally, so they are not genetically equivalent) Which statement below is TRUE? Chromatids move apart during mitosis and meiosis. (Sister chromatids move apart during mitosis and during the second division of meiosis) Are the daughter cells of meiosis I haploid or diploid? Haploid (After meiosis 1, the cells are haploid; they contain one chromosome from each homologous pair) Which statement below is TRUE of meiosis 1? Each daughter cell receives one chromosome from each homologous chromosome pair. (After meiosis 1, each daughter cell receives one chromosome from each homologous pair) In which stage do the sister chromatids separate in meiosis 1? sister chromatids do not separate in meiosis 1 (the sister chromatids remain attached throughout meiosis 1. The homologous chromosome pairs separate during anaphase 1, but the sister chromatids do not) During which stage of meiosis ii do sister chromatids separate? anaphase in meiosis ii are the daughter cells haploid or diploid? haploid which two stages differ the most between meiosis i and ii? prophase & anaphase (prophase i includes steps that are absent in prophase ii, and anaphase i involves the separation of homologous chromosomes while anaphase ii involves the separation of sister chromatids) If two sperm both fertilize the same ovum, what is the resulting zygote? Triploid (3n) the zygote has 3 times the haploid number of chromosomes, producing a triploid cell) Which cell is in mitosis? Cell B (this cell is in mitosis, as it is diploid and the homologous chromosomes are not attached to each other) Which cell is in meiosis i? cell c ( the cell is diploid and the homologous chromosomes are attached to each other) which cell is in meiosis ii? cell A (the cell is haploid and the homologous chromosomes are not attached to each other) which cell is haploid? cell A (the cell has one chromosome from each homologous pair, and half as many chromosomes as the other cells) homologous chromosomes contain the same genes but different specific DNA sequences. TRUE (each of the homologous chromosomes codes for the same genes, but their DNA sequences will typically be different) All cells have pairs of homologous chromosomes FALSE (not all cells are diploid, even for a diploid species. for instance, the products of meiosis (gametes) are haploid, meaning they only have one chromosome from each homologous pair) Which of the following is TRUE? When two haploid cells fuse, the result is a diploid cell (once two haploid cells fuse, there are now two of each homologous chromosome, so the new cell is diploid. This happens during fertilization) Suppose that meiosis produced daughter cells with half as many chromosomes as the parent cell, but the chromosomes were separated randomly, without regard for homologous pairing. Then, one of these gametes underwent fertilization to form a zygote. What challenge would the zygote face as a result? The zygote would probably not have all the genes required by the organism (daughter cells would likely receive two copies of some genes, and no copies of others) Which of the following statements is TRUE? -Genes are different versions of alleles -diploid organisms have two alleles for each gene -homologous chromosomes are equivalent Diploid organisms have two alleles for each gene What is the probability that a gamete will receive the normal (HIV-susceptible) allele of CCR5 (i.e. the black allele on the blue chromosome)? 50% (half of the gametes produced by this cell will receive the HIV-susceptible allele of CCR5.) Which of the following combinations of alleles is NOT possible in a gamete produced by meiosis? HIV-susceptible CCR5 (black on blue), HIV-resistant CCR5 (white on blue), and normal BRCA1 (white on green) [This combination is not possible because the gamete has two copies of the CCR5 allele] If an individual is homozygous for the CCR5-delta32 allele, is it possible for meiosis to produce a gamete that has the normal (HIV-susceptible ) CCR5 allele? No. (individuals who are homozygous for CCR5-delta 32 will produce gametes containing only the CCR5-delta 32 allele) Meiosis WITH crossing over can produce gametes with which of the following combinations of alleles on the green chromosome? -3 alleles that increase type 2 diabetes risk (3 dark alleles) -2 dark alleles and 1 white allele -1 dark allele and 2 white alleles Meiosis WITHOUT crossing over can produce gametes with which of the following combinations of alleles on the green chromosome? 2 dark alleles and 1 white allele. Consider two genes on the chromosome that are close together (e.g A and B in the diagram above), and two that are far apart (A and C) which pair of genes is more likely to have crossing over occur between them on the chromosome? genes A and c (there is a greater chance that crossing over will occur between genes that are further apart than those that are closer together) in general, are alleles from nearby genes on a chromosome likely to be inherited together? why or why not? yes, because there is less space for crossing over to take place between nearby genes which of the following is TRUE?