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New Generations

Year 10, Pathway C 2012. New Generations. Variation and Inheritance. From a previous lesson... Variation is the differences between the characteristics found within a species (controlled by genes) Inheritance is the passing of the parents’ characteristics (genes) to their offspring.

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New Generations

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  1. Year 10, Pathway C 2012 New Generations

  2. Variation and Inheritance • From a previous lesson... • Variation is the differences between the characteristics found within a species (controlled by genes) • Inheritance is the passing of the parents’ characteristics (genes) to their offspring

  3. Inheritance • Genes – location on a chromosome that controls a specific characteristic (eg: eye colour)

  4. Allele • Allele – The different characteristics that a gene can produce (eg: blue eyes or brown eyes) Allele for red flowers Matching pair of chromosomes of a flowering plant Allele for white flowers

  5. Two types of inheritance • Inheritance • Intermediate Dominant/recessive

  6. Inheritance - Intermediate • Intermediate inheritance: Offspring will show characteristics that combine the alleles of the parents BB Cow Bull WW BW Calf We call the calf the F1 generation. If the calf grows up and produces further offspring they would be F2.

  7. Inheritance • Genotype – Description of the alleles of the organism for a particular characteristic (eg: BB, WW or BW for fur colour) • Phenotype – the visible characteristic (eg: black, white or grey fur colour) What is the genotype of the Easter bunny’s coat? What is the phenotype of the Easter bunny’s coat?

  8. Inheritance – Intermediate What would the offspring of a grey bull mating with a black cow be like? • Parent phenotype: Grey Black • Parent genotype: BWBB • Parent gametes: B W B B • Offspring: BB BB BW BW How many offspring have black fur? How many offspring have white fur? How many offspring have grey fur?

  9. Inheritance • Homozygous – another word for pure bred. It means the organism has matching alleles (eg: BB or WW, NOTBW) • Heterozygous – cross bred. Organism will have mismatched alleles (eg: BW)

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