• What did you do over break?

• What questions do you have about the sex linked, Multiple alelle problems?

Traits and Alleles• What if Elmo and Zoe fell in love, got

married and had a baby? What might their baby look like? With your team, come up with a list of as many traits and allele names as possible.

What is Elmo’s Genotype?

• The Trait: Nose Color• Possible Phenotypes:

– Pink = Dominant– Orange = Recessive

• Genotype Key:– P – dominant– p – recessive

Orange Nose!

What is Zoe’s Genotype?• The Trait: Nose Color

• Possible Phenotypes:– Pink = Dominant– Orange = Recessive

• Genotype Key:– P – dominant– p – recessive

Pink nose!

Predicting an Outcome

• What is the probability that Zoe will pass on the allele for a Pink nose?

• Zoe’s genotype is:

• Zoe’s heterozygous!

Pp

1 P allele out of 2 possible alleles, so ½ or 50% chance that Zoe will pass on the allele for a pink nose.

Predicting an Outcome

• What is the probability that Elmo will pass on an allele for an orange nose?

• Elmo’s genotype is:

• Elmo is homozygous!

pp

2 p alleles out of 2 possible alleles, so 2/2 or 100% chance that Elmo will pass on the allele for an orange nose.

Predicting an Outcome

• Can you predict ALL of the possible nose phenotypes Elmo and Zoe’s baby could have?

Xpp Pp

Predicting an Outcome

• Can you predict ALL of the possible nose genotypes Elmo and Zoe’s baby could have?

Xpp Pp

Predicting Outcomes – Punnett Squares

p

p

pP

Sesame Street Genetics

Elmo

Telly

Super Grover (aka Grover)

Rosita

Zoe

Abby