lesson 5 terminology practice genotype and phenotype
TRANSCRIPT
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Lesson 5Terminology Practice
Genotype and Phenotype
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Aa
Genotype Phenotype
Wing Size
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Brown Fur
Phenotype
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Phenotype
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Genotype
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Phenotype
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Phenotype
Dark coloring
Light Coloring
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Xx
Genotype
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Phenotype
Grey Fur
Orange Fur
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Genotype
Tt tT tt
Tt Tt
TT
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Genotype
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Phenotype
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Genotype
Yy
Hh
SS
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Genotype
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Phenotype
Tongue rolling
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Phenotype
Having a Tail
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Phenotype
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Genotype
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Phenotype
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Genotype
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Phenotype
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TT Tt tt
Genotype
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Genotype
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Lesson 5Terminology Practice
Heterozygous and Homozygous
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TT TtHeterozygousHomozygous
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Xx
Heterozygous
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UU
Homozygous
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BB
Homozygous
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Heterozygous
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aA
Heterozygous
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nn
Homozygous
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Pp
Heterozygous
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ii
Homozygous
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lL
Heterozygous
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Lesson 5Terminology Practice
Dominant and Recessive
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Aa
Dominant
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lL
Recessive
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hh
Recessive
Will the trait be dominant or recessive?
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Bb
Dominant
Will the trait be dominant or recessive?
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zZ
Dominant
Will the trait be dominant or recessive?
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bb
Recessive
Will the trait be dominant or recessive?
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mm
Recessive
Will the trait be dominant or recessive?
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Dominant
Will the trait be dominant or recessive?
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44
STOP!
For part 2 of genetics packet
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Lesson 5Punnet Square Practice
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Practice Problem 1 - Part 1
Earlobes have two forms.Unattached earlobes are dominant (E). Attached earlobes are recessive (e). The father is heterozygous. Question: What is his genotype?
Answer: His genotype is Ee because he is heterozygous.
Father E
e
46
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Mother
e e
E
e
MotherPractice Problem 1 - Part 2
Question: If the mother has attached earlobes, what is her genotype?
Answer: Her genotype must be ee because attached earlobes are recessive.
47
Father
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Father
Mother
e
E
e
EE
e
e e
e
ee e
Practice Problem 1 - Part 3
So the father is heterozygous (Ee)The mother is homozygous dominant (ee).
Question: What are the chances that their offspring will have attached earlobes?
Answer: There is a 50% chance because there are two boxes with the ee genotype.
48
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Father
Mother
D
D
D
Dd
d
D D
d
dd d
Practice Problem 2
Dimples are a dominant trait (D)Not having dimples is the recessive trait (d).A mother is homozygous dominant (DD)The father is homozygous recessive (dd).Question: What are the chances they have children with dimples.
Answer: 100% will have dimples because all possible children carry at least one dominant allele.
49
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Practice Problem 3
Freckles (F) are a dominant trait.Not having freckles is a recessive trait (f). Question: If mother is a heterozygous and a father is a homozygous recessive, what are the chances that their offspring will have freckles?
Answer: There is a 50% chance that their offspring will have freckles because the dominant allele appears half the time.
Mother
F
F
f
ff
f
F f
f
ff f
50