Topic: GeneticsAim: 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 furb = White fur Bb x bb

Chance of having a puppy with black fur:

50%

B b

b

b

B

B

b

b

b b

b b

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…

BloodTypes

•A, B, AB, O•A & B genes = dominant•O = recessive

•AA (pure)•AO (hybrid)

Blood Type Agenotype

•BB (pure)•BO (hybrid)

Blood Type Bgenotype

•ABBlood Type ABgenotype

•OOBlood Type Ogenotype

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

AB X OO

•AB x OO

A B

O

O

A

A

B

B

O O

O O

50% blood type A50% blood type B

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

BO

X OO

•BO x OOB O

O

O

B

B

O

O

O O

O O

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

AO

X BO

•AO x BO

A O

B

O

A

A

B

O

B O

O O

25% blood type AB25% blood type A25% blood type B25% blood type O

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

AB X BO

•AB x BO

A B

B

O

A

A

B

B

B B

O O

25% blood type AB25% blood type A50% blood type B

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