Complete the vocab sheet, focusing on your IMOW’s and examples

*Reminder* Lab Report Final Drafts are due

TOMORROW Homework Packets are due TOMORROW

How well do you think we did on the benchmark?

A chart that allows us to determine the different genotypes that offspring can inherit from their parents

Phenotype = the physical trait What can be seen (brown hair) Depends on genotype

Genotype = the alleles of a genetic code Genetic code (one maternal, one paternal)

▪ Homozygous = alleles are the same (BB or bb)▪ Heterozygous = alleles are different (Bb)

Recessive phenotype Genotype MUST be homozygous recessive Genotype bb expresses phenotype blond

hair

Dominant phenotype Genotype may be homozygous dominant

▪ BB expresses brown hair Genotype may be heterozygous

▪ Bb also expresses brown hair

Alleles separate during meiosis

Alleles move to one allele per gamete to make a haploid sex cell

Alleles pair up randomly when gametes unite during fertilization

P: Parent generationF1: Offspring from mating two members of

the P generationF2: Offspring from mating two members of

the F1 generation

Probability is the chance that an event will occur

How do you find the probability of an event?

You take the number of times something happens and put it over the total number of times its possible

Flipping a coin….

B

b

b

B

Parent 1: homozygous dominant = BBParent 2: homozygous recessive = bb

BbBb

Bb Bb

B

b

B

b

Parent 1: heterozygous (Bb)Parent 2: heterozygous (Bb)

bbBb

BB bB

B

b

B

b

Genotypic ratio of offspring 1BB : 2Bb : 1bb

Phenotypic ratio of offspring 3 brown hair : 1 blond hair

(75% chance) (25% chance)

bbBlond hair

BbBrown hair

BBBrown hair

BbBrown hair