Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And...

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Do Now • P. 65 • In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk-shaped fruit (D) is dominant over sphere shaped fruit (d). If a squash plant true-breeding for white disk-shaped fruit is crossed with plant true-breeding sphere yellow fruit. What will be the phenotypic and genotypic ratio?

Transcript of Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And...

Page 1: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Do Now• P. 65

• In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk-shaped fruit (D) is dominant over sphere shaped fruit (d). If a squash plant true-breeding for white disk-shaped fruit is crossed with plant true-breeding sphere yellow fruit. What will be the phenotypic and genotypic ratio?

Page 2: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

How do you determine relatedness?

Page 3: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Case Study• How would you determine whether or not the

parents and the sibling are related to Jennifer? Are they related?

• Take 7 min to come up with an idea as to how you would solve.

Page 4: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

TODAY WE WILL…Discuss what incomplete and codominance are

Understand how In/Codominance patterns occur—simple calculations

Predict whether the inheritance pattern of an individual is inherited through incomplete or codominance.

Page 5: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Read pages 91-93

Start at “Different Dominance Relationships” and STOP at “Epistasis”1. What is codominance?2. What is incomplete dominance?3. Give an example of each.

Page 6: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Notes • Take whatever notes you need on p. 66

• Place the Family Case Study on P. 68

Page 7: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Quick Cap• Mendel looked at peas and their traits, and so

far we have discussed single-gene inheritance and looked at dihybrid crosses/punnett squares.

• Although this was seen in pea plants, inheritance can follow more complex patterns that are not as obvious as dominance and recessiveness

Page 8: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Quick Cap• Recessiveness usually entails that there is a

deficiency in the amount of protein made. When an individual is heterozygous, the dominant allele compensates for the lack of protein made by the recessive allele.

Page 9: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Codominance• This pattern of inheritance usually requires

that different alleles that are both dominant are expressed.

Page 10: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Codominance—examples

Page 11: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Codominance—cow fur• A white cow WW and a red cow RR mate and

have a mixed red and white fur cow

Page 12: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Codominance—blood type• Blood types are a great example of codominance• Blood type is dictated by the presence or lack of antigens on

the surface of red blood cells (RBC’s)• IA can represent A Blood type• IB can represent B type• i represents O type: aka no presence of antigens

Page 13: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.
Page 14: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.
Page 15: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Codominance—blood type

AA AB

AO BO

AB BO

AO OO

Page 16: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Phenotypic and Genotypic Ratios

Page 17: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Incomplete Dominance• This requires that the heterozygous phenotype is

intermediate between that of any homozygote. • A 3rd phenotype is created. Resembles blending

Page 18: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Incomplete dominance—Example

Page 19: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Engage: Whiteboard Practice

Incomplete or codominance?Black hen and white hen mate to make a black and white spotted hen.

Page 20: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Engage: Whiteboard Practice

Incomplete or codominance?Black hen and white hen mate to make a grey rooster.

Page 21: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Engage: Whiteboard Practice

Incomplete or codominance?When a red flower and white flower are crossed to make a pink flower.

Page 22: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Engage: Whiteboard Practice

Incomplete or codominance?

Page 23: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Engage: Whiteboard Practice

Incomplete or codominance?A zebra.

Page 24: Do Now P. 65 In summer squash, white fruit color (W) is dominant over yellow fruit color (w). And disk- shaped fruit (D) is dominant over sphere shaped.

Family Case Study• Now that you have the background

knowledge…solve for the case

• Additional info: : The alleged brother also has a child that is non-tasting. Jennifer and her alleged parents are all True-breeding tasters (TT).


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