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Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Meiosis leads to non-identical cells being formed |
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What sort of cells are produced during meiosis? |
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Mitosis leads to identical cells being formed. |
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What sort of cells are produced during mitosis? |
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Sexual reproduction involves the joining (fusion) of male and female gametes:
? sperm and egg cells in animals
? pollen and egg cells in flowering plants.
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What happens during meiosis? What are examples of gametes in animals and flowering plants? |
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In sexual reproduction there is mixing of genetic information which leads to variety in the offspring. |
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How is variety gained during sexual reproduction? |
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The formation of gametes involves meiosis. |
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What process allows gametes to be formed? |
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Asexual reproduction involves only one parent and no fusion of gametes. |
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How is asexual reproduction different to sexual reproduction? |
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There is no mixing of genetic information. This leads to genetically identical offspring (clones). Only mitosis is involved. |
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How does asexual reproduction lead to clones? Table comparing the products of meiosis to mitosis. (Number of divisions, number of cells formed, haploid or diploid, unique or identical, purpose of division)
Table comparing sexual and asexual reproduction. (number of parents, fusion of gametes, clone or unique, faster or slower, creates variation or not)
EW (Not for separates as they have other content to cover and can complete this activity in a future lesson) Describe the lifecycle of the aphid and describe how it carries out both asexual and sexual reproduction. |
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(HT only) Mutations occur continuously. Most do not alter the protein, or only alter it slightly so that its appearance or function is not changed. |
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What is the effect on the protein if one DNA base is altered due to a mutation? |
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(HT only) A few mutations code for an altered protein with a different shape. An enzyme may no longer fit the substrate binding site or a structural protein may lose its strength. |
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What is the effect on the protein if a few DNA bases are altered due to continious mutations? |
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(HT only) Modelling insertions and deletions in chromosomes to illustrate mutations |
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The normal coding for a gene is GGA ATG. What is the type of mutation for:
1. GGC ATG
2. GGA AT |
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(HT only) A few mutations code for an altered protein with a different shape. An enzyme may no longer fit the substrate binding site or a structural protein may lose its strength. |
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Why does a having few mutations in the DNA code cause problems? |
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(HT only) Not all parts of DNA code for proteins. Non-coding parts of DNA can switch genes on and off, so variations in these areas of DNA may affect how genes are expressed. |
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How can mutations in non-coding parts of DNA affect how genes are expressed? Evaluate the effects of mutations to the genetic code.
Bar headed goose and haemoglobin with higher affinity for oxygen allows it to fly over mountain range on migration rather than around like other geese species.
Sickle Cell Anaemia - negative effects of mutation and also positive effect for malaria resistance.
Neutral mutations - eye colour. |
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