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Understanding Meiosis A Step-by-Step Guide to Cell

This simulation guides students through meiosis, exploring cell division to form gametes. Activities include vocabulary, pre-lab questions, and step-by-step analysis to understand chromosome behavior, DNA replication, and genetic variation.

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    w l Gizmos \ame: Student Exploration: Meiosis Directions: F o l l o w the InetnjctlonB to go through the s l m J s t l t x i . Resporxl Io the q u e s t i o n s end prompts In the o r a n g e b o x e s . Vcoatxjleryiarspnase droTcscnte. crassorer, cytakheste dpkKd, D \ A dcmnart, gamete, genotype, germ cal, hapldd hornclogcus drorncGomett. interphase, mei osls, m e t a c n a s e Thoels, ovum, phenotype, prophase, recessve deter chromatid, sperm c 3 , telophase, zygote Prior Knowledge QuesttensiDo these BEFORE ushig Tre Gizmo. ) 1. Curing mitosis e single cal Ovides to produce two -daughter cells. Viral must happen in tie original cell so that each of the da ughtef c 3 e has a complete set o f c h r c m o e o m e e ’ The cells must replicate their ctrandectnes Ihrotcji D \ A rep- leaner In 1he Synthesis face of the c 3 cycle, and then spin the copied efternosanes n half. to assure that each daughter cel gate an equal amount 2. Curing sexual reproducher., two sex eels ti&e to create a feffilted cell rftr a complete set at dTcmcsomes. '.'.rat must be Hue about the r i m e r of Jiramosomes Ir each sex cell? 5ath tie sex cells must gMe 23 dfranoGomefi, to equal n e 46 chromosorres Tiat are present Ir the daughter cel. G i z m o Warm-up MafasJB is a type of cel dfcletor ihat results n four daughter cells W nar as many chromosomes as the parent cell. These daughter cel s mature Into gametes or eex cells n the ifebsft Gzma, you '*11 leaT tie steps h melcsle ard experiment to produce x s t o m l z e c sex cells ar d cirspchg. On tire STEPS tac, cldc Mate Ya. are oocng al a germ cell , or a cell 1hat '*11 undergo T-elosls to become gametes 1. Read the cescrpllar d interphase at the bottom erf the Gizmo. VJnat happens to tie cell at lire beginning of Interphase? It npicates o r g a r e l e s , and synthestes m R \ A 2. Clide on the DMA n m e nucleus or 1he cdl. Describe what happens. It repllcalee and expands the cell 3. W r y is r necessary tor the cel to grow a r d duplicate Its before lire start of meJoas? .oon r Z< K - m UOB 3-1J-.

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    4. Observe: Telophase I and cytokinesis are the final steps of the first half of meiosis. A. Describe what happens when you click on the chromosomes during telophase 1 They separate. B. Click and drag on the contractile ring. Describe what happened during cytokinesis. They become different separated cells. 5. Observe: Go through the steps of the second half of meiosis until you reach the end of telophase II, following the instructions at the top right comer. As you proceed, answer the questions below. Use the Back button if you need to see a step again. A. Before prophase II begins, does the DNA in the cell duplicate itself? No, this occurs in interphase. B. During metaphase II, do homologous chromosomes pair up as in metaphase 1? No C. How does anaphase II differ from anaphase 1? Anaphase 1 occurs in the parent cell, while anaphase occurs in the daughter cell. D. At the end of anaphase IL how many chromatids are on each side of the cell? ____ 8 E. Are all of the cells the same size? ___ 4 The original parent cell is called diploid because it contains a complete set of homologous chromosome pairs. Each of the four daughter cells is haploid , meaning that each contains half of the original parent cell's chromosomes. Each daughter cell contains one chromatid from each homologous pair. 6. Observe: Click on the spermatids. Spermatids that formed from meiosis will develop into mature male gametes called sperm cells.

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