Admit Slip 2/23/15

Date: 2/23/15 Topic: Punnet Square Practice 1

Page # ___

In chinchillas, “standard” coat color (silver/grey) is dominant to “beige” coat color (light tan).

If you breed a male chinchilla with the genotype Ss to a female chinchilla with the genotype ss, what percent of

their offspring will be standard colored?

Male: Ss Offspring??Female: ss

Get out your SpongeBob HW!!!

Today in Room 315…

ADMIT SLIP: Chinchilla problemHW: SpongeBob Genetics: Incomplete DominanceCONTENT OBJ: SWBAT define and provide examples for incomplete dominanceLANG. OBJ: SWBAT write their own punnet square problemANNOUNCEMENTS: ASPEN sadness…AGENDA:Spongebob ReviewPTC testingMake your own Punnet sq problemIncomplete dominanceEXIT SLIP: Begin SpongeBob HW

Date: 2/23/15 Topic: Punnet Square Practice 1

Page # ___

SpongeBob HW Review

How do you think it went??

Did you get it all right?

PTC Testing

Directions: Put the paper on your tongue.

How many people taste something? __________

How many people do not? __________

The ability to taste PTC is dominant (T)

The ability to not taste PTC is recessive (t)

Based on your taste, what might your genotype be?

PTC Punnet Square

Who tastes it? (Has tasting allele = dominant)

Who does not? (Has non-tasting allele = recessive)

If the taster is heterozygous and they have children, what percentage of the children would have the non-tasting allele?(Complete a Punnet square)

Write your own…

You have 7 minutes to write your own Punnet square problem involving one trait.

Directions: 1) Write the problem on a separate sheet of paper2) Complete the problem in your journal (aka create an answer key)3) Find a partner and switch problems to complete4) Check your answers with each other

If you come up with a good one, I can use it in future years!

Example Problems

Ex 1) Lions can have thick manes or thin manes. Thick mane (T) is dominant to a thin mane (t). The following parents breed: father = TT mother = Tt. What percent of their children will have a thick mane?

Ex 2) Maria is heterozygous for brown eyes. If brown is dominant to blue, what were the possible genotypes of her parents?

If you come up with a good one, I can use it in future years!

Switch!

Solve each others problems, then check your answers with your partner. Did you both reach

the same conclusion?

Rate your confidence

Rate yourself from 1-5 by holding up fingers

5 being “I GOT THIS!” and 1 being “Whaaaa?”

Review

Dominant?

Recessive?

There’s some other options…

Incomplete Dominance*

One allele is not completely dominant over another, resulting in an “intermediate” (blend between the two) during a heterozygous condition

Think…Can youmake sense of it?

Incomplete Dominance

Explain in your own words.

What happens if you breedtwo pink flowers together?(Do the punnet square)

Snapdragons = type of flower

Breed pink w/ pink?

• What percentage of each color will you get?

• 25% Red• 50 % Pink• 25% White

Practice ProblemsCurly hair (C) is dominant to straight hair, but wavy hair results from incomplete dominance.

What are the genotypes of these children?

Practice ProblemsIf hazel eyes result from incomplete dominance between brown (BB) and green (GG), what would the genotype of this child be?

BG

Note: The genotype forincomplete dominance could include one big and one small or two different letters

Ex. Rr = pink in plantsEx. BG = hazel in eyes

HW: SpongeBob Part 3

Incomplete Dominance

Finished sheet due tomorrow!

Begin now

Punnet Sq Games

http://vital.cs.ohiou.edu/steamwebsite/downloads/FurryFamily.swf

Later Review (includes sex linked): http://reviewgamezone.com/game.php?id=61