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Punnett  Squares Tuesday - Bellwork Punnett  Squares Tuesday - Bellwork

Punnett Squares Tuesday - Bellwork - PowerPoint Presentation

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Punnett Squares Tuesday - Bellwork - PPT Presentation

Create a Venn diagram comparing phenotype and genotype Use the words physical appearance genetic makeup heterozygous homozygous describes an organism purple tall Pp greenpp Describe the difference between complete dominance incomplete dominance and codominance ID: 736628

square punnett phenotypes results punnett square results phenotypes genotypes offspring cross probability create genotype tosses squares corn coin heads yellow tails black

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Slide1

Punnett SquaresSlide2

Tuesday - Bellwork

Create a Venn diagram comparing phenotype and genotype: Use the

words physical appearance, genetic makeup, heterozygous, homozygous, describes an organism, purple, tall, Pp, green,pp

Describe the difference between complete dominance, incomplete dominance, and codominance

IFC: What is the first step in the scientific method? A. make a hypothesis B. Ask a question C. draw conclusions D. do background researchSlide3

Wednesday bellwork – 10/23

In a cross between a yellow fish and a blue fish all of the offspring are green. What kind of dominance is this?

In some flowers blue and white are codominant. Describe the phenotypes of each of these flowers

BB WW BW

IFC:

Chemists often make models of molecules using balls to show atoms and sticks to show bonds.

The models help them see what the molecules might look like.

What is a limitation of this model?

The models wont last as long as real molecules

The colors of the balls and sticks would not show the molecule’s real color

Real molecules are very small and complex, models could only approximate what they look like.

Chemists are bad model makers so they would not be very usefulSlide4

Science Fair Topic and Question research

Today you will find a testable question for your science project.

Log in to my website:

akbrownscience.weebly.com

Choose the science fair tab. You will find links to sites with topic and question ideas.

Look through the topic ideas and questions to help you get an idea for your project – choose at least 3 today and write them in your science fair log

Remember to write down the site you got the ideas from so you can find them again

When you finish, begin looking for background research on your project.Slide5

Thurs. Bellwork – 10/24

In Pea plants, round peas (R) are dominant over wrinkled peas (r).

What is the genotype of a homozygous recessive pea plant?

What is its phenotype?

What is the genotype of a heterozygous pea plant

What is its phenotype?

IFCSlide6

EQ: how are patterns of inheritance studied?

OBJ: I can predict patterns in heredity because I can create Punnett squares and read pedigrees

SC.7.L.16.2

Determine the probabilities for genotype and phenotype combinations using Punnett Squares and pedigrees.Slide7

What is probability?

Probability

is the likelihood that a particular event will occur

It can be written as a:

Fraction ____

Percent ____

Ratio ____

1/4

25%

1:3Slide8

What is a Punnet Square?

A

Punnett

square is a model that helps you find the probability of different outcomes from genetic crossesSlide9

COIN FLIP

There are 2 possible outcomes:

HEADS TAILS

capital

http://www.arborsci.com/CoolStuff/CoinFlip.jpg

The chance the coin will land on either one is:

______ ______ _____

Alleles separate randomly just like a coin flip. . . So can use probability to predict outcomes of genetic crosses.

1/2

50%1:1Slide10

Probability and Tossing Coins

If you toss a coin, what is the probability of getting heads?

Tails?

If you toss a coin 6 times, how many heads and how many tails would you expect to get?

Working with a partner, have one person toss a coin 6 times while the other person tallies the results on a sheet of paper. Then, switch tasks to produce a separate tally of the second set of 6 tosses. Slide11

Assuming that you expect 3 heads and 3 tails in 6 tosses, how do the results of your tosses compare? How about the results of your partner’s tosses? How close was each set of results to what was expected?

Add your results to those of your partner to produce a total of 12 tosses. Assuming that you expect 6 heads and 6 tails in 12 tosses, how close are these results to what was expected?

If you compiled the results for the whole class, what results would you expect?

How do the expected results differ from the observed results?Slide12

A Punnett square helps us predict the

probability

that an offspring with a particular

genotype

and phenotype will be produced

What is a Punnett Square

I

wish I could make a punnett squareSlide13

To Make a Punnett square there are a few simple steps to follow:

 

1)

draw a

box

and divide it into

four

parts

How do I create a Punnett Square?Slide14

2)

label the

left

hand side of the box with the genotype of one

parent

(R=Red, r=White)

R

r

How do I create a

Punett

Square?Slide15

3) label the

top

of the box with the genotype of the other

parent

R

r

r

r

How do I create a Punnett SquareSlide16

4) In the middle boxes place

2

letters. One letter comes from the

left

side and one from the

top

R

r

r

r

RrrrRrrrHow do I create a Punnett SquareSlide17

You now know the possible genotypes for the offspring of these two parents

.

The genotypes and phenotypes can be given a ratios, fractions, or %s

How do I Interpreti a Punnett SquareSlide18

Complete and check with your shoulder partner

. A cross between a female with straight hair (HH) and a male with curly hair (hh)

 

genotypes___________

phenotypes__________()

Practice ProblemsSlide19

What are the possible genotypes of the offspring?

What are the possible phenotypes of their offspring?

(% and color)

Black eyes (B) are dominant over red eyes (b) in some rats.

Make a cross between two HETEROZYGOUS rats.

75 % black eyes

25% red eyes

B b

B

b

BB Bb Bb bb25% BB

50% Bb25% bbSlide20

What are the possible genotypes of the offspring?

What are the possible phenotypes of their offspring?

(% and color)

Make a cross between a Homozygous Dominant rat and a homozygous recessive rat.

100% Black eyes

B B

b

b

Bb Bb

Bb Bb

100% eterozygousSlide21

2. A cross between a black dog (Bb) and a brown dog (bb)

 

 

genotypes_____________ (#BB:#Bb:#bb)

phenotypes____________ (#Black:#Brown)

Practice ProblemsSlide22

3. A cross between a yellow corn (Yy) and another yellow corn (Yy) (y = white corn)

 

 

 

 

genotypes_________________

phenotypes_______________

Practice ProblemsSlide23

Guinea Pig Punnet squares

Write the possible outcomes for the guinea pig offspring in the boxes

Cut out the appropriate guinea pig and glue in the spaceSlide24

Bellwork:

While scientists already know a great deal about DNA, they continue to learn more about its role in

genetics.What

is the basis of scientists’ current understanding of DNA?

A. They guess how they think it works.

B. They use combined empirical evidence from many scientists.

C. They only use evidence that they have personally proven.

D. They assume they already know all there is to know, even when evidence contradicts that assumption

.

IFC

3. Create a Punnett square to show a cross between a yellow corn (Yy) and another yellow corn (Yy) (y = white corn)genotypes_________________ phenotypes_______________Slide25

Celebrity punnett squares

You will pick 2 random celebrities

Their traits are listed on their picture – do not destroy them I need them all day

Make 6

punnett

squares to determine the genotypes and phenotypes of their offspring