Genetics Buzzwords the set of genes (alleles) that an organism possesses physical appearance of an organism. when two alleles (gene types) are identical when the two alleles are different different forms of the same gene

allele which controls the characteristic whenever it is present. allele whose characteristics only show up when it is present on both chromosomes BB or Bb bb

Determining characteristics In pea plants, tallness (T) is dominant to dwarfness (t) A tall pea plant could have a genotype of: TT Tt Both combinations have the same phenotype- tall. A dwarf pea plant could only have the genotype tt Phenotype- dwarf. homozygous dominant heterozygous homozygous recessive

Gene combinations The simplest genetic cross involves one characteristic and is called a monohybrid cross. In this the parents (P) are crossed (bred) with each other, and the offspring (F1 generation) observed and counted. Follow the procedure on the board!!

This explains how the sex of a child is determined by X and Y chromosomes. gametes This can also be shown and combinations worked out using a Punnett square: XX XXX YXY Mother XX XX Father XY XY Offspring: Male or female? XXXYXXXY FFMM 1:1 ratio male to female offspring

Task 1. Complete the problems in the Monohybrid Crosses booklet DO NOT SKIP STEPS!! Always define the alleles Always draw the Punnet square 2. Let´s play Traits Bingo! (15 min)

Keywords review Can you match up the key words to the definitions? You only have 4 min before the bomb goes off!

STARTER: Get your brains in gear! NO NOTES!!! A – normal skin pigmentation a – albino What percentage chance is there of producing a child with albinism?

Tasks this lesson 1: Finish the Monohybrid Crosses revision booklet (15 min) 2: Try the problems in the More Monohybrid crosses booklet! (20 min) 3: Let’s play Traits bingo! (15 min)

STARTER 1.Who is known as “the man of 1000 peas?” 2.How long has he been running his experiments for? 3.How many plants did he grow? 4.What did he notice when he first grew pea plants? 5.What field of biology has come about because of his experimenting on peas?

Tasks this lesson 1.Finish the More Monohybrid Crosses booklet 2.Attempt the past paper questions (put the theory into practice!) 3.Finish the lyrics!

Tasks this lesson 1.Have a go at the past paper question booklet 2.Read the Mendel´s Laws booklet and answer the questions 3.The genetics of skin colour TED talk