Organic Chemistry Mitosis And Meiosis Answer Key

Mitosis and Meiosis (25 Points) 1. (1 pt each) (a) If the parent cell starts out with 24 chromosomes and undergoes mitosis, then the daughter cells have __24___ chromosomes. (b) In Meiosis if the parent cell has 40 chromosomes, then the daughter cells have __20___ chromosomes. (c) A diploid cell in a buffalo has 60 chromosomes. A sperm or egg cell in a buffalo can be expected to have ___30___ chromosomes. 2. (0.5 pt each) Select whether the process occurs during Mitosis, Meiosis, or both and write which phase it happens (interphase, prophase, etc) Processes DNA replication Mitosis/Meiosis/Both meiosis Phase Interphase Disintegration of nuclear membrane mitosis prophase Generation of spindle mitosis prophase Crossing over meiosis Prophase Independent assortment meiosis anaphase Separation of sister chromatids Mitosis The second division Separation of sister chromatids Meiosis anaphase I Separation of homologous chromosomes both Anaphase Reformation of nuclear membrane mitosis prophase 3. (1 pt each) In the box above each image, write whether it is referencing Mitosis or Meiosis. In the box next to each image, write which phase the image is indicating. Phase metaphase Phase Metaphase 1 Telophase 1 Anaphase 4. (1 pt each) ? Figure 1 Figure 1 Which phase is this? Telophase Is this animal cell or plant cell? Animal What is the name of the structure indicated by the ‘?’ ? Cleavage furrow Figure 2 Figure 2 Which phase is this? ___________________ Is this animal cell or plant cell? ____________________________ What is the name of the structure indicated by the red arrow? _________________________________ 5. Determine the possible gamete(s) for a genotype (1 pt each) Roles: (1) Gametes contain HALF of the genes from the parents (result of meiosis) (2) Homologous genes (same letter regardless of capital or lower case) can NEVER appear in the same gamete (separation of homologous chromosomes in ana I) (3) List ALL possible combinations (independent assortment in meta I) Based on the roles above, please write possible gametes for the following genotypes (note: please separate different gametes by commas). Genotype Possible gametes Genotype Possible gametes AA 1 AaBb 4 Aa 2 AABb 3 AAbb 2 AABbEe 6 6. Observe slides provided ‘Cell division videos and slides’ file within this content folder. (1 pt each) Observe the “onion root tip” and “animal cell division”slides Try to find cells under ‘metaphase’ and ‘anaphase’. Once you find the desired cells, write at least one similarity and one difference between the different cell types below. a. Similarity, if any, between onion root tip and animal cell during: metaphase: anaphase: b. Difference, if any, between onion root tip and animal cell during’ metaphase: anaphase