mm genetics lesson. module 6.tpowell
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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
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
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