Learning Objectives:1. Explain how gametes are made by meiosis2. Describe differences and similaritiesbetween mitosis and meiosisStarterDraw and label a sperm and egg cell in yourbook – don’t look back in your book! Saturday 8 June 2013Activity1:Meiosis
Meiosis• A special type of cell division producinggametes• Happens in sex organs– Ovaries and testes• Gametes contain half the number ofchromosomes. This is called haploid• Meiosis results in variation
Stages of meiosis
2 Main stages1. Homologous chromosomes separated.Creates 2 daughter nuclei2. 2 daughter nuclei divide. Chromosomesthemselves are seperated. Creates 4gametes.
Activity• Using pipe cleaners (4 differentcolours) OR string – model the stages ofmeiosis• Do this in your book.• Label your diagrams
Similarities and differencesbetween meiosis and mitosis• Use pages 29 and 27 to create a tableshowing the similarities and differencesof meiosis and mitosis.Mitosis MeiosisWhere does it occurNumber of divisionsCreatesNumber of chromosomesProducesFunction
Similarities and differencesbetween meiosis and mitosisMitosis MeiosisWhere does it occurNumber of divisionsCreatesNumber ofchromosomesProducesFunction
To finish off..Unscramble these keywords.The person who finishes first can go firsttoday!
Characteristics of authentic activities7. Authentic activities can be integratedand applied across different subjectareas and lead beyond domain-specificoutcomes.Activities encourage interdisciplinaryperspectives and enable diverse roles andexpertise rather than a single welldefinedfield or domain
Activity 2:To know theadaptations and job of sex cells.• What do youthink you willlearn about intodays lesson?1._______2._______3._______
To know the adaptations and jobof sex cells.• All: State some basic features of sex cellsand outline how fertilisation takes place.• Most: Describe adaptations of sex cellsand how fertilisation happens in humans.• Some: Relate the structure of sex cells totheir function and explain the process offertilisation in detail.
To know the adaptations and jobof sex cells.• Draw the male and female sex cellsand label them.• What do you already know about them?• Where are they made?• What special features do they have?On miniwhiteboards!
Sex cells - SpermIn males the sex cells are called sperm.Sperm are produced in sex organs called testes.To know the adaptations and jobof sex cells.
Sex cells - EggsIn females the sex cells are called eggs.Eggs are produced in sex organs called ovaries.Nucleuscontainingchromosomescytoplasmmembranejelly coatAn egg is so big that this is howbig a sperm looks next to it.The egg is 30 times bigger!To know the adaptations and jobof sex cells.
Sperm or Egg?To know the adaptations and job of sex cells.
To know the adaptations and jobof sex cells.• What isFERTILISATION?
Fertilisation and ImplantationTo know the adaptations and job of sex cells.
To know the adaptations andjob of sex cells.• All: State some basicfeatures of sex cells andoutline how fertilisationtakes place.• Most: Describeadaptations of sex cellsand how fertilisationhappens in humans.• Some: Relate thestructure of sex cells totheir function and explainthe process offertilisation in detail.Situations vacant-• Write a job descriptioneither for an egg orsperm.• Read to your partner.• Can they guess the sexcell?• How would they improveit?
• Success criteria- Situations vacant-• Write a jobdescription either foran egg or sperm.• Read to your partner.• Can they guess the sexcell?• How would theyimprove it?To know the adaptations and jobof sex cells.
To know the adaptations and jobof sex cells.SpermcellsEgg cellshavearejoina taila largecytoplasmproducedwith anegg cellbecauseinto makeit is used as a energy sourcefor the fertilised egg todevelopthe ovariesa fertilised egg cell.this develops into theembryo.they need to swim up intothe uterus.
egg tube / fallopian tubeglandspermegghormoneovarytestis menstruationovulationcervixscrotumpenispubertyvaginawomb / uterusfertilisationlabouramniotic fluidumbilical cordplacentaChoose 6 words and write them in your bingo card
Characteristics of authenticactivitiesAunthetics used3. Authentic activities comprise complex tasks to be investigatedby students over a sustained period of time.Activities are completed in days, weeks, and months rather thanminutes or hours, requiring significant investment of time andintellectual resources.4. Authentic activities provide the opportunity for students to examinethe task from different perspectives, using a variety of resources.The task affords learners the opportunity to examine theproblem from a variety of theoretical and practical perspectives, ratherthan a single perspective that learners mustimitate to be successful. The use of a variety of resourcesrather than a limited number of preselected references requires studentsto detect relevant from irrelevant information
Activity 3:Pregnancy: The developing babyUse the activity to label the foetusLearning objective:To be able to describe how the baby survives during pregnancy.To learn how the developing baby survivesTask 1:
Continue…Task 2:What does each part do?Use the website to complete these sentences:The foetus is__________________________________________The umbilical cord connects_____________________________The amniotic fluid_____________________________________The placenta is________________________________________________________________________________________________________________________________________________
Continues…Task 3:What crosses the placenta?The placenta is like a filter. It stops some things from crossing from themum to the baby (for example blood). Luckily it allows some things to crossover!Do you know what crosses over and which way?MOTHER BABYPlacentaCarbon Dioxide Water Oxygen FoodAlcohol Blood Urine (wee)
Continues…Final Task:Can you make a model of a developing foetus? Use some of the modellingmaterials to make your model foetus (Remember a model doesn’t have tolook exactly the same as the real thing).Some things you could use:Bag Balloon Pipe Sponge Bottle NewspaperMake sure you can explain how your model is like a developing foetus! Canyou describe what each part does (L4b) can you explain where the placentais and what happens across it? (L5).FINAL THOUGHT: Do you think alcohol can pass to the baby through theplacenta? Why? Why not?
Characteristics of authentic activities.1. Authentic activities have real-world relevance.Activities match as nearly as possible the real-world tasksof professionals in practice rather than decontextualized orclassroom-based tasks.6. Authentic activities provide the opportunity to reflect.Activities need to enable learners to make choices and reflecton their learning both individually and socially.