Topic: Genetics Aim: Describe multiple alleles and explain the inheritance of blood types. Do Now: Review HW: Ditto – Reproductive Systems Review (BOTH SIDES!!!)

1.What is structure A? How was it produced? 2. Which structures represent cleavage? 3. What is structure E? 4. What is structure F? 5. What process occurs after structure F is formed?

One dog carries the heterozygous black fur trait and the other carries homozygous recessive white traits. What are the chances of having a puppy with black fur?

B = Black fur b = White fur Bb x bb Chance of having a puppy with black fur: 50% Bb b b B B b b b b bb

Yellow is dominant in flowers & white is recessive. A white flower and a heterozygous yellow flower are crossed. Determine the percentage of white offspring.

Multiple Alleles More than 2 alleles for a trait Skin color, blood type, height…

Blood Types A, B, AB, O A & B genes = dominant O = recessive

AA (pure) AO (hybrid) Blood Type A genotype

BB (pure) BO (hybrid) Blood Type B genotype

AB Blood Type AB genotype

OO Blood Type O genotype

Example #1: Cross a person with blood type AB with someone who has blood type O. ABX OO

AB x OO AB O O A A B B OO OO 50% blood type A 50% blood type B

Example #2: Cross a person who is hybrid for type B with someone who has blood type O. BOX OO

BO x OO BO O O B B O O OO OO 50% blood type B 50% blood type O

Example #3: Cross a person who is hybrid for blood type A with someone who is hybrid for blood type B AOX BO

AO x BO AO B O A A B O BO OO 25% blood type AB 25% blood type A 25% blood type B 25% blood type O

Example #4: Cross a person who has blood type AB with someone who is hybrid for blood type B. ABX BO

AB x BO AB B O A A B B BB OO 25% blood type AB 25% blood type A 50% blood type B

So in order to conceive a child with type O, what must both parents be carrying?