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Dominance: Co-Dominance, Incomplete Dominance and Blood Typ Dominance: Co-Dominance, Incomplete Dominance and Blood Typ

Dominance: Co-Dominance, Incomplete Dominance and Blood Typ - PowerPoint Presentation

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Dominance: Co-Dominance, Incomplete Dominance and Blood Typ - PPT Presentation

Lesson Objectives Minds ON Yesterdays Recap Dominances and Blood Types Blood Typing Lab Success Criteria Homework Take Up New homework Minds ON Two rabbits are heterozygous Brown fur B is dominant to white fur b Dwarf small ears D are dominant to floppy ears d Draw a ID: 543193

dominant blood person type blood dominant type person dominance white red types roan rhesus recessive colour haired square occurs

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Slide1

Dominance: Co-Dominance, Incomplete Dominance and Blood TypesSlide2

Lesson Objectives

Minds ONYesterday’s Recap Dominances and Blood Types

Blood Typing LabSuccess Criteria

Homework Take Up New homework Slide3

Minds ON

Two rabbits are heterozygous. Brown fur (B) is dominant to white fur (b). Dwarf (small) ears (D) are dominant to floppy ears (d). Draw a

Punnett square showing the possibilities.

We’ll do it together on the board once you’ve tried it. Slide4

Yesterday’s Recap

Dihybrid

CrossesRefers to the crossing of two individuals who are both heterozygous for TWO traits (e.g.

PpTt x PpTt)Assumes that these traits are on different genes and can occur at the same time.

E.g. Pod

colour

and seed

colourSlide5

Dihybrid Crosses

Parent 1 genotype is: AaBb

Parent 2 genotype is:

AaBbSlide6

Dominances

So far, we have been looking at situations where a dominant trait completely masks the allele

Bb/BB = dominant for purple colourSlide7

Incomplete Dominance

Occurs when:N

either gene is dominant or recessive

The gene effect is mixed We use 2 different letters for the homologous

pair since neither

is

dominant

.Slide8

An Example of Incomplete Dominance

With red and white snapdragons, the dominant allele that codes for the colour red is not completely dominant over the recessive allele that produces the white colour. The result is a pink flower. Slide9

Using a Punnett Square

Red Flower – RR White Flower

– WW

R = 100% Pink Offspring

x

W

W

R

RW

RW

R

RW

RWSlide10

Co-Dominance

Occurs when:Neither gene is dominant or recessive

Gene effects are NOT mixed

Therefore, both genes are expressed at the same time!Examples: Roan cow or Camelia

flower Slide11

An Example of Co-Dominance

Write C (for co-dominance) and a super script (R=Red,

W=white)Red haired = CRCR

White haired = CWCWRed and White (Roan) =CRCWSlide12

Using a Punnett Square

Red haired = CRCR

White haired = CWCW

Red and White (Roan) =CRCW = 100% Roan

X

XSlide13

Blood Types – A Special Case

There are three

alleles:

IA (Type A), IB (Type B) and i (Type O)A and B are co-dominant

O is recessive

+/- is the

Rh (Rhesus)

factor

(if

the Rh blood antigen is present, the person is Rh+; if not, they are

Rh-)

Predict offspring

bloodtypes

for:

Heterozygous type A mother, type O fatherSlide14

Using A Punnett

Square

X

i

i

i

ii

i

i

ii

X

i

i

ii

i

ii

IA (Type A), IB (Type B) and

i

(Type O)

-A

and B are co-dominant

-O

is recessive

50% = A

5-% = OSlide15

Blood Types

  

Types

Distribution

Ratios

O+

1 person in 3

38.4%

O-

1 person in 15

7.7%

A+

1 person in 3

32.3%

A-

1 person in 16

6.5%

B+

1 person in 12

9.4%

B-

1 person in 67

1.7%

AB+

1 person in 29

3.2%

AB-

1 person in 167

0.7%

AB universal plasma donors

AB+ universal recipients

O+ blood most needed

O- universal RBC donorSlide16

Rhesus Disease

An individual either has, or does not have, the "Rhesus factor" on the surface of their red blood cells.

The status is usually indicated by Rh positive (Rh+ does have the D antigen) or Rh negative (Rh− does not have the D antigen) suffix to the ABO blood type

.Rhesus Disease

occurs when there is incompatibility between blood types of mother and fetus.

Untreated, the result can cause death of the child.

Occurs in second and later

pregnanciesSlide17

Murder Mystery Lab

“I THINK THERE’S BEEN…(sunglasses on)..AN ACCIDENT!” (with emphasis)

https://www.youtube.com/watch?v=mznsEcZlM2I&noredirect=1

The Jim Carrey shows us…

https://

www.youtube.com/watch?v=HJSqkwyL1ZoSlide18

Lab

There’s been a murder. Hortatio

needs your help! You have to find out who did it. Agglutination:

refers to the clumping effect of blood when it is mixed with Anti-A , Anti-B or Rh serum . Go around to each station and sample the blood to find out the blood type and Rh factor to determine who killed One-Eyed Earl!