Meiosis Review & KEY PDF

Name: _______________ Period: _______________ CELL DIVISION - MEIOSIS answer key vocabulary practice Use this link – bit.ly/meiosisvocab1 - to complete the vocabulary matching below by writing the letter of the def...

Name: _______________ Period: _______________ CELL DIVISION - MEIOSIS answer key vocabulary practice Use this link – bit.ly/meiosisvocab1 - to complete the vocabulary matching below by writing the letter of the definition next to the correct vocabulary word. h a. Spindle fibers disappear and new nuclear membrane forms around ___ Prophase I each set of chromosomes c ___ Metaphase I b. A cell that contains only one set of chromosomes (instead of like a normal cell with 2 pairs) k ___ Anaphase I c. Pairs of homologous chromosomes line up in center of cell. Each centromere attaches to spindle fiber f ___ Telophase I d. Process in which homologous chromosomes exchange portions of their chromatids to increase genetic variation i ___ Prophase II e. Duplicated chromosomes move to the center of the cell – centromere attaches to spindle fiber from each side e ___ Metaphase II f. Cytoplasm divides and two new cells form with duplicated chromosome from each similar pair g ___ Anaphase II g. Chromatids separate and move to opposite end of cell as individual chromosome a ___ Telophase II h. Nucleus dissolves, crossing over occurs in this stage m ___ Homologous i. Duplicated chromosomes and spindle fibers reappear in each new chromosomes cell d ___ Crossing Over j. Error in meiosis where homologous chromosomes fail to separate – resulting in gametes with too few or too many chromosomes j ___ Non-disjunction k. Homologous chromosome pairs are pulled to opposite ends of the cell (chromatids do NOT separate) b ___ Haploid l. A cell that contains two sets of chromosomes, one from mother and one from father l ___ Diploid m. Chromosomes that have the same sequence of genes, same structure and pair during meiosis n ___ Gamete n. Sex cells, each containing half of the genetic information in the parent organism Write the number of chromosomes in each stage of meiosis. The 46 first one has been 92 23 done for you. 23 46 23 23  Use this link – bit.ly/meiosisvocab1 - to complete the vocabulary activities below. Fill in the missing spaces in the chart below then ANSWER THE PRACTICE QUESTIONS in the last column. WORD PICTURE PRACTICE QUESTION If a diploid carrot cell has 18 chromosomes, how many are in a haploid carrot cell? a. 36 HAPLOID b. 27 c. 18 d. 9 What happens in Metaphase II of meiosis? a. Sister chromatids separate b. Identical pairs of chromosomes separate METAPHASE II c. Sister chromatids line up in center of cell d. Pairs of sister chromatids line up in center of the cell An area of a chromatid is exchanged with the matching area on another chromatid is called: a. Crossing over CROSSING OVER b. Mutagenesis c. Hybridization d. Fertilization In which phase do PAIRS of chromosomes line up in the center of the cell? a. Prophase I METAPHASE I b. Metaphase I c. Metaphase II d. Telophase I How many cells are there at the end of Telophase II of meiosis? a. 2 ANAPHASE II b. 3 c. 4 d. 5 Which is the result of non-disjunction? a. 4 identical diploid cells NON- b. Haploids with too few or too many DISJUNCTION chromosomes c. 2 different diploid cells d. 4 identical gametes What are the cells called that are produced during meiosis? a. Somatic cells GAMETE b. Gametes c. Diploid cells d. Body cells  Use this link – bit.ly/meiosisvocab1 - to complete the vocabulary activities below. Fill in the blank for the paragraph below using the word bank and the link above: Doubling Anaphase I Center Four Gametes Meiosis Telophase I Half Nuclear Interphase Variation Pairs membrane Crossing over Metaphase II Anaphase II Prophase I Spindle fibers Telophase I Unlike mitosis that occurs in somatic cells in your body, meiosis occurs in the sex cells. Meiosis, LIKE mitosis begins with interphase where the cell prepares to dividing by doubling it’s DNA. After interphase, the cell is in prophase I. This is where the exchange of genetic material occurs, or crossing over. Crossing over increases genetic variation in a species and is what gives us all our different traits! Then metaphase I is where the pairs of homologous chromosomes line up down the center of the cell. The actual pairs get separated and move to opposite sides of the cell during anaphase I. After anaphase I, the cytoplasm divides into two new cells during telophase I, each having one duplicated chromosome from each similar pair. After this first round of meiosis, we move into prophase II, where the spindle fibers reappear in each new cell. Then the duplicated sister chromatids line up along the center of the cell in metaphase II, where each centromere attaches to two spindle fibers that will pull the sister chromatids apart in anaphase II, where they are now individual chromosomes on either side of the cell. The last part of meiosis is telophase II, where the nuclear membrane forms around each new set of chromosomes. There are four resulting cells, or gametes, that half half the number of chromosomes as the starting cell. Label all of the stages of meiosis below and describe the main thing that happens in each stage. 1. Interphase 6. Prophase II - Cell gets ready to divide - Spindle fibers reappear in by doubling the DNA new cells 2. Prophase I 7. Metaphase II - Nuclear membrane dissolves - Sister chromatids line up and crossing over occurs in center and centromere attaches to spindle fibers from each side of cell 8. Anaphase II 3. Metaphase I - Sister chromatids - Pairs of sister chromatids line up and separate and one each pair attaches to a spindle fiber chromosome each goes to either side of cell 9. Telophase II 4. Anaphase I - Nuclear membranes - Each pair of sister chromatids gets reappear around new pulled to opposite sides of the cell and sets of chromosomes the chromosomes DO NOT SEPARATE and cytokinesis occurs 5. Telophase I - Cleavage furrow forms and separates cytoplasm into two cells with pairs of each set of chromosomes RESULT: 4 haploid gametes