Transcript Genetics Notetaker

SPONGE
 Some people have brown eyes, some have blue,
and some have green.
 Some people have earlobes attached directly
to their head, while others have earlobes that
hang loose.
 Where do people get these different traits?
2. How are they passed from one generation to
the next?
Sponge
SpongeBob’s aunt and uncle, SpongeWilma and
SpongeWilbur, have the biggest round eyes in the
family. Wilma is believed to be heterozygous
for her round eye shape, while Wilbur’s family brags
that they are a pure line. Complete the Punnett square
to show the possibilities that would result if Sponge
Wilma and Sponge Wilbur had children.
Sponge
Mr. Whipple had a rose that was red with the genotype
Of RR and Mrs. Whipple had a rose that was
Yellow with the genotype of YY. Complete a
Punnett square for what their offspring would look
Like.
SPONGE
What do you get when you cross a bridge with a
Bicycle?
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Vocabulary
Heredity- The passing of traits from parent to offspring
Dominant trait- A trait observed when at least one dominant
Allele for a characteristic is inherited. (B)
Recessive trait- A trait that is apparent only when two
Recessive alleles for the characteristic
Are inherited. (b)
Genes- Segments of DNA that carry hereditary instructions
Located on chromosomes and passed from parent
To offspring.
Alleles- Alternative forms of a gene that govern the same
Characteristics (Bb, bb, BB)
GenotypePhenotype-
The inherited combination of alleles
An organism’s inherited appearance
Punnett Square- A tool used to visualize all the
Possible combinations of alleles
From parents.
B
b
B
b
BB
Bb
Bb
bb
Probability- The mathematical chance that an event
will occur.
Homozygous- the state of having two identical alleles
of a particular gene (eg AA, aa).
Heterozygous- The state of having two different alleles
of a specific gene. (Aa, Bb)
Sponge
The allele for a cleft chin, C, is dominant among
Humans. What would be the results from a cross
Between a woman with the genotype Cc and a man
With the genotype cc? Create a Punnett Square
Showing this cross.
c
c
C
c
Cc
Cc
cc
cc
Take Your Chance
You have two guinea pigs you would like to breed.
Each has brown fur and the genotype Bb. What
Are the chances that their offspring will have white fur
with the genotype bb. Try this to find out.
Stick a piece of masking tape on both side of two
Quarters. Label one side of each quarter with a
Capital B and the other side with a lowercase b.
Toss both coins 50 times, making notes of your
Results each time. How many times did you get the
Bb combination? What is the probability that the next
Toss will result in bb?
Sponge
You have two guinea pigs you would like to
breed. Each has brown fur and the genotype Bb.
What are the chances that their offspring will
have white fur with the genotype bb?
Sponge
A curly eared cat mated with a cat that had normal ears.
If half the kittens had the genotype Cc and curly ears,
And the other half had the genotype cc and normal ears,
Which was the allele for curly ears?
Sponge
Michael has a dog that is purebred for a golden
lab which is dominant. He just found out his friend
has a standard poodle who is purebred recessive.
If the two dogs had babies, what percentage of the
pups would be purebred?
Sponge
Amy was heterozygous for rolling tongue which is
Dominant and Doug is homozygous for non-rolling
Tongue. Create a punnett square to show the possible
Outcomes of their offspring.
Sponge
 If Mrs. Essary was dominant for the trait of
a abnormally long second toe (eeww!) (TT)
and her husband was recessive for a short
second toe (tt), what is the probability that
their children would have a normal (I mean)
small short toe?