What are we made of?. Check yes or no Do you have detached earlobes?
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Transcript of What are we made of?. Check yes or no Do you have detached earlobes?
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Alien GeneticsWhat are we made of?
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Trait SurveyCheck yes or no
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Do you have detached earlobes?
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Can you roll your tongue?
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Do you have dimples?
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Are you right handed?Which one is
my right hand ?
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Do you have freckles?
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Do you have naturally curly hair?
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Do you have a cleft chin?
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Do you have allergies?
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Clasp your hands together.Is your left thumb over your right?
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Can you see anything in this image?
If you can not see the number 2 in this picture, you are color blind.
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Is the hairline on your forehead straight?
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Are you male or female?
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It’s note taking time
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GeneticsHeredity: passing characteristics from
parent to offspring
Gene: segment of DNA or hereditary unit
Genetics: branch of biology devoted to the
study of heredity
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Father of Genetics
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What we know now
loci
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Mendel’s Theory of Heredity1. For every trait, there are two copies of the
gene (one from each parent)
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Mendel’s Theory of Heredity2.There are alternative versions of genes (alleles)
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Mendel’s Theory of Heredity3. When two different alleles are present, one is expressed (dominant)while the other is not visible (recessive).
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Alleles can be Dominant or Recessive
Dominant: always expresses itself (capital letters are used to represent dominant alleles)
Recessive: only expressed in absence of a dominant allele
(lowercase letters are used to represent recessive alleles)
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More termsIf two alleles code for the same characteristic
they are homozygousTT = homozygous dominanttt = homozygous recessiveIf the alleles are different they are
heterozygousTt = heterozygous
Let’s practice
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Dominant vs. Recessive Allelesin Creatures
Triangle eyes are dominant
Star eyes are recessive
T Triangle eyes t Star eyes
By looking at an individuals alleles, we can describe their Genotype: genetic makeupPhenotype: what they look like
Genotype for star eyes tt
Phenotype: star eyes
Genotype for Triangle eyes TT
Tt Phenotype: Triangle eyes
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From the handout:Practice: For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho).
____RR
____Rr
____TT
____pp
____Hh
____BB
____Nn
____Ll
____ll
____ss
____Tt
____aa
Determine the phenotype for each genotype using the information provided
Round head is dominant over oval head
RR _____________________ Rr ______________________ rr ____________________
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ActivityObtain 2 allele cards for each trait (no
peeking)Write down your genotypes on the My
Creature handoutWrite down your phenotypes on the My
Creature handoutDraw your creature
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Evaluation• Name three recessive traits
in this alien.
• What are the two possible genotypes for this alien’s number of fingers?
• This alien’s genotype for number of legs is Ll. If it married another alien with genotype Ll, what is the probability that their baby would have five legs? Express as a fraction and percent.