Meiosis BIOL 1111 Introduction Meiosis is the second important kind of nuclear division. It resembles mitosis in many ways but the consequences of meiotic divisions are very different from those of mitotic divisions. While mitotic division may occur in almost any living cell of an organism‚ meiosis occurs only in special cells. In animals‚ meiosis is restricted to cells that form gametes (eggs and sperm). Each species has a characteristic number of chromosomes per somatic cell. Fruit flies
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Meiosis Review Worksheet Pledge: _____1. If the sperm cell of a fruit fly has 4 chromosomes‚ then the number of chromosomes in each body cell is: a. 2 b. 4 c. 6 d. 8 e. 16 _____2. Of the following cells‚ the only one to have the haploid number of chromosomes is: a) skin b)muscle c) nerve d) connective e) ovum _____3. The diploid number is restored as a result of: a) differentiation
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Meiosis Modeling Activity Background Information Meiosis is the process by which eukaryotic organisms produce egg and sperm having half the genetic information (haploid) of the other cells in the organism’s body (diploid). You will notice some similarities to mitosis but some definite differences in meiosis that result in genetic diversity in the gametes as well as the offspring formed by the eventual fusion of the egg and sperm. Two of the most noted differences in meiosis are that 1) there
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I started my period sometime after Christmas on a Sunday morning when I was in seventh grade‚ (I only know it was after Christmas because I ruined the skirt we had bought me for my Christmas outfit from Limited Too‚ I was SO MAD). I remember being in the middle of my Sunday school class and thinking that I must have peed myself on accident‚ getting up after the class was over going to the bathroom and freaking out about blood being every where. I put a pad on that my mom encouraged me to carry in
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I. Karyotype Analysis of Human Chromosomes 1. Karyotype preparation and analysis Cells (from blood‚ amniotic fluid‚ etc) are grown in vitro (in a cell culture dish) to increase their number Cell division is then arrested in metaphase with colchicine (prevents mitotic spindle from forming) Cells are centrifuged and lysed to release chromosomes Chromosomes are stained‚ photographed‚ and grouped by size and banding patterns This is a photograph of the 46 human chromosomes in a somatic cell‚
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I remember at the time when I started to go to school‚ my father used to tell me how bad the conditions were when he was studying. How he studied sitting below street lamps when there was no electricity in the house‚ how he was forced to do a job leaving his graduation incomplete when they had not enough money even to buy books. Still he continued working hard and completed his graduation successfully. When I see myself having everything I need or even more than that‚ I don’t think I have a reason
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Crossing over- The two chromosomes making up a homolog pair are not genetically identical because homologs are inherited from different parents. When the chromosomes synapse during prophase 1‚ each gene in each chromosome is brought into contact with the same gene on that chromosome’s homolog. During this process of synapses the two chromosomes of each homolog pair exchange segments of DNA in a process called crossing over. The gene combinations on a chromosome can be changed. For example‚ suppose
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Meiosis is extremely critical because its job is to check that all species produced by sexual reproduction include the right number of chromosomes we should have. This activity decreases the number of chromosomes in half‚ permitting the sexual reproduction process to prevail. Because meiosis produces cells that eventually becomes reproductive cells‚ this division in chromosome number is critical to the cell cycle. Without this process‚ the combination of two gametes during fertilization would result
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1. 2. 3. All of Allison’s eggs will carry the X chromosome and 50% of Allison’s egg cells will carry the recessive allele (hexa). 4.a. There is a 25% chance that Allison and Tim will have a baby boy who is heterozygous for Tay-Sachs. b. No‚ the baby boy will not have Tay-Sachs he will be a carrier for the disease. The boy would only have the disease if he was homozygous recessive. | X | Y | X | XX | XY | X | XX | XY | 1:2 1:2 | T | t | T | TT | Tt | t | Tt | tt
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1 – Mitosis and Meiosis 1. A certain species has three pairs of chromosomes: an acrocentric pair‚ a metacentric pair‚ and a telocentric pair. Draw a cell of this species as it would appear in metaphase of mitosis. (BAP 2.18) 2. A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages? (BAP 2.20) a) G2 of interphase b) Metaphase I of meiosis c) Prophase of mitosis d) Anaphase I of meiosis
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