Genetics Tutorial

Teresita A. PowellTec 551

Module 6

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What is Genetics and where did it begin?

• Genetics is the study of how traits are passed from parents to offspring.

• The work began with Gregor Mendel, a priest in a central European monastery, who bred pea plants for over ten years. Mendel observed the results of traits such as height, color, and seed and pod shape

Vocabulary to know

1. Alleles Different forms of a gene

2. Gene Factors that control traits

3. Dominate allele A trait that is always expressed

4. Recessive allele A trait that is masked

5. Hybrid Offspring has 2 different traits

6. Purebred Offspring ‘s trait is the same as the parent

7. Phenotype An organism's physical appearance

8. Genotype An organism’s genetic makeup

9. Homozygous Genotypes made of the same alleles

10. Heterozygous Genotypes made of 2 different allelesENTER

Play Time!

Click here to play the Genetics Matching game!!

Click here to play Concentration with our vocabulary

Vocabulary Quiz

Mrs. Powell Genetics Vocabulary Quiz

What did Mendel study in his experiments?

X

Mendel’s Experiment

Tall Tall Tall Tall

(F1)

Short seemed to disappear

Tall

(F2)

Short reappears

Tall ShortTall Tall

Interpreting Punnett Squares

T t

T

t

TT

T t t

T t

t

What is the

probability of

getting a

homozygous

outcome?

2/4 = 1/2

1:2

50%

Play Video Click here to move to the

next slide after the movie.

Black fur (B) is dominant over

white fur (b) in guinea pigs.

Cross a homozygous black and

a heterozygous black.

Punnett Square Practice

B B

B

b

BB BB

Bb Bb

• What is the phenotype of each offspring?

• How many offspring are homozygous for hair color?

• What is the probability of getting a heterozygous offspring?

Black fur is dominant over white

fur in guinea pigs.

Cross two homozygous black

guinea pigs.

B B

B

B

BB BB

BB BB

• What is the phenotype of each offspring?

• How many offspring are heterozygous for hair color?

• What is the probability of getting a hybrid offspring for hair

color?

In pea plants, round (R) is dominant over wrinkled (r) for seed shape.

Cross a hybrid round and a wrinkled seed plant.

R r

r

r

Rr rr

Rr rr

• What is the phenotype of each offspring?

• How many offspring are heterozygous for seed shape?

• What is the probability of getting a purebred offspring for

seed shape?

YY X yy

Y Y

y

y

yellow

green

Yy

yellow

(yellow)

= 100%

(green)

= 0%Yy

yellow

Yy

yellow

Yy

yellow

Following this activity go take the quiz at the following website . Remember to use symbols to answer some of the

questions. When you are done hit control-Alt-PrtSc then open a word document and hit control “V” to paste your

work. Finally printout the work http://biology.clc.uc.edu/courses/bio105/geneprob.htm