Variation and Inheritance

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Presentation transcript:

Variation and Inheritance National 5 Biology Key Area 5: Variation and Inheritance National 4 Biology Key Area 4 Genetic Information

By the end of the lesson you will be able to ….. Use family trees to identify the genotype and phenotype of individuals

Keep it in the family Families look alike

Family trees or pedigrees

Now used by geneticists to predict genotypes and phenotypes in a family.

The McLelland Family Tree (Red hair is recessive phenotype) Male - red Male – non-red Mrs Skillen Mr Skillen (the original) Mrs McLelland (the original) Mr McLelland Female - red Female – non-red R - non red r – red hair Annoying Little Brother Perfect Child (ME!) My hubby Brother Hollie

What is the genotype for R? What is the genotype for S? The allele for free earlobes (E) is dominant to the allele for fixed earlobes (e) What is the genotype for R? What is the genotype for S? Ee ee

Hh HH/Hh The allele for red hair (h) is recessive to non-red (H) Work out what genotype the dad must be. What 2 possible genotypes will the sister have? Hh HH/Hh