Alternative Patterns of Inheritance

Incomplete Dominance Heterozygote creates a new phenotypic trait that is in between the dominant and the recessive ( i.e. middle) ex. Snap dragon flowers can be Red (RR), Pink(RW, or white(WW) with different allele combinations Ex. Hair texture Curly, wavy, straight ( C, S)

Lets practice 1.Predict the genotypes and phenotypes of a cross between a red snapdragon and a pink snap dragon 2.Predict the genotype and phenotypes of a cross between 2 individuals with wavy hair.

Co- Dominance In the heterozygote, both alleles are expressed at the same time. Example: Coat color in the horses can be red ( RR), white (WW), or Roan ( RW). Roan = both red and white hairs in the coat color at the same time

Lets practice 1.Predict the genotypes and phenotypes of a cross between a White cow and red cow. 2.Predict the genotype and phenotypes of a cross between 2 individuals from the F1 generation from question #1

Multiple Alleles Traits are controlled by more than 2 alleles Ex Blood type uses 3 alleles (I A, I B, i) Which alleles do you think are dominant? Which alleles are recessive? Would any of theses alleles demonstrate an alternative pattern of inheritance?

What are the different blood types? Type A Type B Type AB Type O What would be the genotypes for those phenotypes? I A I A or I a i I B I B or I b i I A I B ii Let’s Read about how blood type influences some cultures… And answer the questions.

Make sure your blood type article is complete so that we can grade Also Make sure that your practice punnett squares worksheet is complete. We will go through both of these… today and take more notes

ABO SYSTEM is NOT THE ONLY ONE Rh + Rh -

MOM is _____ & BABY is ____ OTHER BLOOD TYPES ____________________ IF: Image modified from: MOM is _____ & BABY is _____ Rh + Rh - NO PROBLEMS

Can be a ___________ IF: Mom is _____ Baby is _____ Image modified from: 1 st baby OK but few baby cells entering mom ’ s bloodstream put mom ’ s immune system on alert for + cells. Next + baby, mom ’ s immune system can attack baby as it is growing Mom given shot after 1 st birth prevents this Rh+ PROBLEM Rh -

Homework Complete the punnett squares practice work sheets

WARM UP COMPLETE THE INCOMPLETE AND CO-DOMINANCE WORKSHEET Only answer #s 6-9, 11, 14, 19 Complete the problems on a separate piece of paper.

Sex Linked Traits Some Examples of sex- linked traits…

Sex Linked Inheritance

Sex – linked traits

When setting up a punnett square…

Let’s Practice A bald man marries a normal female. Determine the phenotypic ratio for the offspring. - A bald male marries a carrier female. What are the chance that all the children will be bald?

Polygenic Traits Traits are controlled by several genes. Ex. Skin, eye, and hair color are controlled by more than one gene.

Pedigree – shows patterns of inheritance Individuals either have the trait, do not have the trait, or are a carrier for the trait Carrier = individual who has ONE copy of a recessive allele DRAW and LABEL THE PEDIGREE ACCORDING TO THE FOLLOWING SCENARIO: Han Solo, son of Owen, and Leia, daughter of Anikin, both have freckles, but their son Jedd does not. Queen Amadala, died giving birth to twins, Luke and Leia. Leia has freckles, but her brother does not. Han’s brother, Chewie, and his sister, Padme, like their mother, Peru, do not have freckles.