Year 10, Pathway C 2012.  From a previous lesson...  Variation is the differences between the characteristics found within a species (controlled by.

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Presentation transcript:

Year 10, Pathway C 2012

 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

 Genes – location on a chromosome that controls a specific characteristic (eg: eye colour)

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

 Inheritance  IntermediateDominant/recessive

 Intermediate inheritance: Offspring will show characteristics that combine the alleles of the parents CowBull Calf BBWW BW We call the calf the F1 generation. If the calf grows up and produces further offspring they would be F2.

 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?

 Parent phenotype: GreyBlack  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? What would the offspring of a grey bull mating with a black cow be like?

 Homozygous – another word for pure bred. It means the organism has matching alleles (eg: BB or WW, NOT BW)  Heterozygous – cross bred. Organism will have mismatched alleles (eg: BW)