Transcript Genetics


Three-fourths (3/4) of the plants produced by
a cross between two unknown pea plants
have axial flowers and ¼ have terminal
flowers. What are the genotypes of the
parent plants?
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Parent genotypes:
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What cross would result in ½ of the offspring
having green pods and ½ of the offspring
having yellow pods?
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Cross:
Homozygous dominant X anything = 100% dominant offspring
Heterozygote X homozygous recessive = 50% dominant 50% recessive
Heterozygote X heterozygote = 75% dominant 25% recessive
Homozygous recessive X homozygous recessive = 100% recessive
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B
B
B
b
B
b
b
b
?
B? B?
b
Bb bb
B
BB Bb
b
bb bb
?
B? B?
b
Bb bb
b
Bb bb
b
bb bb
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Analyze the data in at your table and draw 3
conclusions about the following:
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1.) What factors are affecting the genotype
frequencies?
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2.) What factors are affecting the allele frequencies?
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3.) If we were to mate 2 more rounds using the
offspring from round 4 to start, predict the
distribution of alleles. Support your prediction with
the data.
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Clay’s clips of the day!
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In the deep rainforests of Brazil lives the Ocamazi tribe, amongst
the members of this tribe exists a dominant trait for webbed feet
(A), most have this trait, those that don’t have non-webbed feet
(a). Additionally most members of this tribe webbed hands(B), a
small minority have normal non-webbed fingers (b). Needless to
say this tribe is great at swimming.
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Problem: An Ocamazi princess Heterozygous for both webbed
feet and fingers travels to another tribe to meet her soon to be
husband, his tribe also has webbed feet which is also heterozygous
for but no webbed hands which he is homozygous for. Draw the
cross for the mating of these two people.
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Princess: FfWw
Fw
Fw
fw
Husband: Ffww
fw
Interpret this data!
FW
FFWw
FFWw
FfWw
Fw
FFww
FFww
Ffww
Ffww
fW
FfWw
FfWw
ffWw
ffWw
fw
Ffww
ffww
ffww
Ffww
F-Webbed Feet, f-Non Webbed Feet
W- Webbed hands, w-Non Webbed hands
FfWw
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You are a world-famous breeder of Purple-People
Eaters. Tragically, your entire stock perishes in a fire
except for two individuals. They are both
heterozygous for all three traits desired. The three
traits are as follows:
Traits
EE or Ee=Two eyes
ee= One eye
HH or Hh= Two horns hh= One horn
FF or Ff= Non-flying ff= Flying
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1.) What did Mendel contribute to the field of Genetics?
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2.) Explain the difference between phenotype and genotype.
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3.)Give an example of an ‘allele.’
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4.)Give an example of a recessive allele Mendel discovered in
the pea plants.
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5.) What does it mean to be ‘Heterozygous’ for a given trait?
Created by Punnet
Used to predict possible
outcomes of crosses
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Nn x NN
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Genotype ratio:
Phenotype ratio:
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Aa x aa
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Genotype ratio:
Phenotype ratio:
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Tt x Tt
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Genotype ratio:
Phenotype ratio:
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Cross two plants that are heterozygous for
green pods
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Genotype ratio:
Phenotype ratio:

Mr. Nichols
PHHS

1.) What did Mendel contribute to the field of Genetics?

2.) Explain the difference between phenotype and genotype.

3.)Give an example of an ‘allele.’

4.)Give an example of a recessive allele Mendel discovered in
the pea plants.

5.) What does it mean to be ‘Heterozygous’ for a given trait?
Created by Punnet
Used to predict possible
outcomes of crosses

Nn x NN

Genotype ratio:
Phenotype ratio:


Aa x aa

Genotype ratio:
Phenotype ratio:


Tt x Tt

Genotype ratio:
Phenotype ratio:


Cross two plants that are heterozygous for
green pods
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Genotype ratio:
Phenotype ratio:
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The first student to write all of the different
options for Punnett squares gets 10 bio
bucks!
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Cross a plant that is heterozygous for axial
flowers with a plant that has terminal flowers.
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Genotype ratio:
Phenotype ratio:
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Cross a homozygous tall plant with a short
plant.
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Genotype ratio:
Phenotype ratio:
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Cross a plant that is heterozygous for smooth
pods with a plant that had constricted pods.
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Genotype ratio:
Phenotype ratio:
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When a tall plant is crossed with a short plant,
some of the offspring are short. What are the
genotypes of the parents and the offspring?
What is the phenotypic ratio in the offspring?
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Parent genotypes:
Offspring genotypes:
Phenotypic ratio:
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WELCOME BACK!!!
“PREPARE THY SELVES FOR MORTAL
COMBAT……INVOLVING BIO BUCKS AND
CAPITAL LETTERS, AHHHHHHH!!!!”
-Mr. Nichols
A.K.A: Get some paper and a pencil ready.
Mr. Nichols
PHHS