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It’s What Makes Me
Me
Time to Split!
Picture This
Pass the Trait
Mixed Bag
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Who are the two
scientists credited for discovering
DNA?
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James Watson and Francis
Crick
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Scientists describe the shape of the
DNA molecule as this?
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Double Helix
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Name the 4 nitrogen bases found in DNA and explain
how they bond.
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Adenine (A), Thymine (T),
Guanine (G) and Cytosine (C)
A and T bond together.
G and C bond together.
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What holds the nitrogen bases
together to make up the rungs of
the ladder in DNA?
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Nitrogen bases bond to their
corresponding nitrogen base by hydrogen
bonds
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What is the three part basic
building block of DNA called and what are the three parts?
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It is called a nucleotide. It is
made up of a sugar called deoxyribose, a phosphate group
and a nitrogen base.
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Name the 6 phases of the cell cycle in
order.
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Interphase,Prophase, Metaphase,
Anaphase,Telophase and Cytokinesis
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This is the stage of the cell cycle where the chromosomes
split at the centromere into two
separate chromatids. Sister chromatids move to opposite poles of the cell.
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Anaphase
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Explain what happens during
Interphase.
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During Interphase the
cell obtains nutrients to
grow. The cell prepares to
divide by making a copy of its DNA.
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What stage of the cell cycle does the cell spend most of
its time in?
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Interphase
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Explain how DNA
replication occurs.
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DNA replication is another way of saying the DNA is copied. This occurs during
interphase.
1)Hydrogen bonds between the nitrogen bases break and the two strands
separate much like a zipper coming apart.
2) Nucleotides that are floating in the nucleus fill in correct spots on both strands of DNA. There are now two complete identical double helixes of
DNA
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Describe this phenotype.
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Blue eyes
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This is a picture of one cell in one of the phases in the cell cycle. What
phase is it in?
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Metaphase
*You can notice that the
chromosomes are lined up in the
center of the cell.
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What is the name of this tool that is used to predict the probability of offspring
genotypes?
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Punnett Square
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What phase comes directly before this picture? What phase directly follows it?
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This cell is in Anaphase so the phase that comes
directly before it is Metaphase and the phase that directly
follows it is Telophase.
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The green shape is Thymine and the purple shape is Cytosine.
1) What does the red represent?
2) What does the yellow represent?
3) What is the dark blue on the sides of molecule?
4) What is the aqua on the side of the molecule?
5) What do the small circles in the center of the molecule represent?
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1) Red = Adenine
2) Yellow = Guanine
3) Blue = Deoxyribose
4) Aqua = Phosphate group
5) Circles = Hydrogen bonds
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In Mendel’s experiments yellow seed color is
dominant to green seed color. Explain why the
phenotype of a pea plant would be yellow seed color if it had a genotype of Yy.
You must use correct vocabulary.
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Answers will vary-because yellow is
dominant to green the one dominant allele (Y) masks or hides the one recessive allele and all
you can see is the dominant color.
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Explain the below genotypes using two
different sets of vocabulary
(purebred/hybrid or homozygous/heterozygo
us).
1) FF 2) Ff 3) ff
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1) Either Homozygous Dominant or Purebred Dominant
2) Heterozygous or Hybrid
3) Either Homozygous Recessive or Purebred Recessive
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Angelina Jolie is a hybrid for straight hairline. Brad Pitt is
homozygous recessive for widow’s peak.
Angelina is pregnant AGAIN! (no not really) Predict the
probabilities for both genotype and phenotype by
completing a punnett square.
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s s
S
s
Ss Ss
ss ss
50% homozygous recessive, widow’s peak
50% heterozygous, straight hairline
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Having a cleft chin is dominant over not having a cleft chin.
Predict the percentages for having a child with a
cleft chin if a hybrid man is crossed with a woman that does not
have a cleft chin.
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C c
c
c
Cc cc
Cc
cc
50% woul
d have
a cleft chin
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In rabbits, the allele for a spotted coat is dominant over the allele for a solid colored coat. A spotted
rabbit was crossed with a solid color rabbit. The
offspring all had spotted coats. What were the
genotypes of the parents. Explain.
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We know that if spotted is dominant and one parent has a solid coat that that parent must
have a genotype of ss because the only way you can see the
recessive trait is to have two recessive alleles. If all offspring
had spotted coats than the other parent must be SS because if it had a recessive allele then that allele would be passed down to 50% of the offspring and 50%
would be solid.
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A chromosome is made up of 2 sister
_______________
and held together by a ___________________.
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chromatids ,
centromere
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This stage ends with the cell membrane pinching into two daughter cells.
This stage is different in an animal cell compared to a plant cell because a plant
cell has a cell wall therefore a cell plate forms
to divide cell in two.
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Cytokinesis
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Below you are given half a strand of DNA . What would be the
other half?
ATTTGGCGATG
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Given-ATTTGGCGATG
Answer-TAAACCGCTAC
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What are the different forms of a
gene called?
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Alleles
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How many chromosomes does
each sex cell (egg and sperm) carry?
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Each carry 23 chromosome
s, ½ the number
needed to make a human.