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With your host…Ms. Turner!
Meiosis, Karyotypes, Non-disjunction, Fertilization, & DifferentitationTest Review
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Vocab Meiosis Karyotypes & Non-
disjunction
Fertilization
Miscellaneous
10 10 10 10 1020 20 20 20 2030 30 30 30 3040 40 40 40 4050 50 50 50 50
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Vocab: 10
What are homologous
chromosomes?ANSWER
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Vocab: 10 - Answer
Same size and shape, and contain the same genes
(may be different
versions – thus slightly
different DNA)
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Vocab: 20
What is a tetrad? (use the correct vocabulary)
ANSWER
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Vocab: 20 - Answer
A tetrad is a pair of homologous chromosomes
(these match up during Prophase I of meiosis)
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Vocab: 30Draw a picture and
indicate how homologous
chromosomes are different from sister
chromatids.ANSWER
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Vocab: 30 - AnswerSister chromatids are actually
identical, because they come about through DNA replication.
Homologous chromosomes
are not necessarily
identical, they carry the same genes – they
could be different
versions of the gene.
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Vocab: 40
Is this cell haploid or
diploid? Somatic or gamete? 2n
or n?ANSWER
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Vocab: 40 - AnswerThe cell is diploid (it has
pairs of homologous chromosomes), thus it would be a somatic cell (such as a skin cell or muscle cell – any
body cell), and is 2n
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Vocab: 50
What is cell differentiation?
ANSWER
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Vocab: 50 - AnswerThe process by which cells
are directed to specialize into various different
tissues.
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Meiosis : 10What stage of Meiosis is
this?
ANSWER
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Meiosis : 10 - AnswerMetaphase I of Meiosis
(notice the formation of tetrads – pairs of homologous
chromosomes)
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Meiosis : 20How are homologous
chromosomes matched up and in what phase of
meiosis do they pair up?
ANSWER
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Meiosis : 20 - AnswerThey pair up by same size (and
they contain the same type of
genes).During Prophase I
they pair up.
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Meiosis : 30
What stage of meiosis is this in?
What event is happening which
increases variation in offspring?
ANSWER
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Meiosis : 30 - AnswerProphase I
Crossing over occurs and increases genetic variation
in the daughter cells
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Meiosis : 40What event in this stage
leads to variation?
ANSWER
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Meiosis : 40 - AnswerIndependent Assortment (during Metaphase I) leads to genetic variation in the
daughter cells.
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Meiosis : 50
If a cell starts with 20 chromatids at the beginning
of Meiosis, how many chromosomes will be in one
of the haploid cells at the end of Meiosis?
ANSWER
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Meiosis : 50 - AnswerIf there are 20 chromatids
then the cell is starting with 10 chromosomes.
After meiosis is complete, each haploid daughter
cell will have 5 chromosomes each
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Karyotypes & Non-disjunction : 10
How are the chromosomes arranged in a karyotype? (be specific!)
ANSWER
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Karyotypes & Non-disjunction : 10 - Answer
Chromosomes are arranged in homologous pairs from BIGGEST TO SMALLEST
with the sex chromosomes at the very end.
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Karyotypes & Non-disjunction : 20
Is this from a 2n or n cell? How can you
tell?
ANSWER
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Karyotypes & Non-disjunction : 20 - Answer
This karyotype come from a cell that is 2n.
You can tell it is a diploid (2n) cell because the chromosomes are in
their homologous pairs.
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Karyotypes & Non-disjunction : 30
In a human, how many
autosomes are there? How many sex
chromosomes?
ANSWER
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Karyotypes & Non-disjunction : 30 - Answer
44 autosomes (or 22 pairs)2 sex chromosomes (or 1
pair)
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Karyotypes & Non-disjunction : 40What
aneuploidy would this individual
have? What
disorder is this called?
ANSWER
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Karyotypes & Non-disjunction : 40 - AnswerAneuploidy – XXY (has an
extra X chromosome)Klinefelter’s Syndrome
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Karyotypes & Non-disjunction : 50
How does a non-disjunction in Anaphase I compare to
Anaphase II?
ANSWER
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Karyotypes & Non-disjunction : 50 - AnswerAnaphase I
• Homologous chromosomes (tetrads) fail to
separate• Results in aneuploidy
in all daughter cells
Anaphase II• Double stranded chromosome (sister chromatids) fail to
separate• Results in aneuploidy
in half of the daughter cells
Anaphase I
Anaphase II
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Fertilization : 10
What is a fertilized egg called?
(a fertilized egg results from an egg and sperm fusing together…
what is this new cell called?)
ANSWER
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Fertilization : 10 - Answer
A zygote!
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Fertilization : 20
What are sex cells called?And where are they made?
ANSWER
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Fertilization : 20 - Answer
Sex cells (egg and sperm cells) are called gametes.Egg cells made in ovaries, sperm cells made in testes
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Fertilization : 30
What is the correct sequence that describes the
development of a baby?Baby, Embryo,
Fertilization, Fetus, Zygote
ANSWER
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Fertilization : 30 - AnswerFertilization, Zygote, Embryo, Fetus, Baby
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Fertilization : 40
How many chromosomes are in a human gamete?
How many chromosomes are there in a human
zygote?ANSWER
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Fertilization : 40 - Answer
23 chromosomes are in a human gamete
46 chromosomes are in a human zygote
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Fertilization : 50
Why is it important that both gametes are haploid?
ANSWER
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Fertilization : 50 - AnswerBoth gametes are haploid because when they come together they will make a
fertilized diploid cell(thus RESTORING the original
amount of chromosomes)
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Miscellaneous: 10
True or False: Homologous chromosomes
are exactly identical.
ANSWER
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Miscellaneous: 10 - AnswerFalse, homologous
chromosomes contain the same types of genes, but they
may be different versions. Thus the sequence of DNA
nucleotides could be different!
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Miscellaneous: 20What kind of aneuploidy does a person that have Turner’s syndrome have?
2n-1 or 2n+1How do you know?
ANSWER
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Miscellaneous: 20 - Answer2n-1
They are missing one of their X chromosomes (in every single cell)
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Miscellaneous: 30What would the n value for
this cell be?
ANSWER
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Miscellaneous: 30 - Answer2n
It has homologous pairs of chromosomes
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Miscellaneous: 40If the cell starts with 40
chromosomes at the beginning of Meiosis, how
many chromosomes will be in one of the haploid cells
at the end of Meiosis?ANSWER
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Miscellaneous: 40 - Answer
20 chromosomes(the number is halved in
meiosis)
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Miscellaneous: 50
How is spermatogenesis different from oogenesis?(definition + difference in
the END RESULT)
ANSWER
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Miscellaneous: 50 - AnswerSpermatogenesis (production of
sperm) produces 4 functional haploid sperm cells at the end of
meiosis,Oogenesis (production of eggs)
produces 1 functional haploid egg cell and 3 haploid polar bodes
that later disintegrate.