| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Students should be able to explain the term chromosome |
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What is the definition for gamete? |
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Students should be able to explain the term gene |
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What is the definition for a chromosome? |
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Students should be able to explain the term allele |
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What is the definition for a allele? |
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Students should be able to explain the term dominant |
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What is the definition for a dominant? |
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Students should be able to explain the term recessive |
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What is the definition for a recessive? |
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Students should be able to explain the term homozygous |
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What is the definition for a homozygous? |
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Students should be able to explain the term hetrozygous |
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What is the definition for a hetrozygous? |
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Students should be able to explain the term genotype |
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What is the definition for a genotype? |
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Students should be able to explain the term phenotype |
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What is the definition for a phenotype? |
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Some characteristics are controlled by a single gene, such as: fur colour in mice; and red-green colour blindness in humans. Each gene may have different forms called alleles. |
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Give two examples of characteristics that are controlled by a single gene |
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The alleles present, or genotype, operate at a molecular level to develop characteristics that can be expressed as a phenotype. |
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How are genotype and phenotype related? |
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A dominant allele is always expressed, even if only one copy is present. |
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What is the phenotype when there is a dominant allele? |
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A recessive allele is only expressed if two copies are present (therefore no dominant allele present). |
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What is the phenotype when there are two recessive alleles? |
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If the two alleles present are the same the organism is homozygous for that trait, but if the alleles are different they are heterozygous. |
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What is the difference between homozygous and hetrozygous alleles? |
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Most characteristics are a result of multiple genes interacting, rather than a single gene. |
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Are most characteristics controlled by single genes or multiple genes interacting? |
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Students should be able to understand the concept of probability in predicting the results of a single gene cross, but recall that most phenotype features are the result of multiple genes rather than single gene inheritance
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What is the probability of a child having homozygous recessive alleles if their parents are both hetrozygous for a trait? |
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Students should be able to use direct proportion and simple ratios to express the outcome of a genetic cross. |
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What is the probability of a child having hetrozygous alleles if their parents are both hetrozygous for a trait? |
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Students should be able to complete a Punnett square diagram and extract and interpret information from genetic crosses and family trees. |
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What is the probability of a child having a diseases that is carried on a dominant alleles if their parents are both hetrozygous for a trait? |
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(HT only) Students should be able to construct a genetic cross by Punnett square diagram and use it to make predictions using the theory of probability |
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What is the probability of a child having homozygous dominant alleles if their parents are both hetrozygous for a trait? Complete Punnett squares. Identify incorrect Punnett squares, calculate the chances and ratios from a Punnett square.
(decent worksheet in B2.3 folder)
HT - give questions about crosses and get pupils to construct Punnett or work backwards to find phenotypes of parents. |
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