Biology 3.3 - Meiosis
7th Grade Science
Junior Scientist__________________________________________________
MAIN IDEA
ASEXUAL
REPRODUCTION
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SEXUAL REPRODUCTION
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MEIOSIS
DETAIL NOTES
Asexual Reproduction: Only __ parent is needed.
What happens? The structures inside the parent are
__________________ and _________exact copies are
made.
What type of cell division is this?_______________
Remember this type LIST PHASES OF MITOSIS:
MOST CELLS IN YOUR BODY REPRODUCE
THROUGH _____________.
EXAMPLES IN ANIMALS: Sponges bud....
Sexual Reproduction: ________ parent cells join
together to form _______________that are different
from the parents.
The parent cells are called __________cells.
Sex cells are _______________from ordinary body
cells.
Most body cells carry 2 sets of genes or __________
chromosomes.
Sex cells carry only 1 set of genes - HALF THE
NUMBER OF CHROMOSOMES =
________________CHROMOSOMES
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Sex cells are made during __________.
WHAT IS MEIOSIS?:
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Each sex cell receives one-half of each
_______________pair.
For example: a human egg cell has ____
chromosomes, and a sperm cell has _________
chromosomes.
The new cell that forms when an egg and a sperm cell
join has ___________ chromosomes.
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Biology 3.3 - Meiosis
7th Grade Science
Junior Scientist__________________________________________________
MAIN IDEA
GENES AND
CHROMOSOMES
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DETAIL NOTES
What did Walter Sutton discover:
MEIOSIS
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Watch Brain Pop on Meiosis. :)
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What happens during Meiosis?
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How many new cells are produced in Meiosis compared
to Mitosis?________________
MEIOSIS AND MENDEL
SEX CHROMOSOMES
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Sex chromosomes carry __________ that determine sex.
Females have ________ X chromosomes.
Males have ____X and ____Y chromosome.
When meiosis produces the egg cells, each egg gets 1
X chromosome and 1 Y chromosome.
Meiosis produces sperm with either an _______or
______ chromosomes.
XX =________________
XY = _______________
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The Y chromosomes DOES NOT carry all of the
genes of an X chromosome.
Females have ___________ X chromosomes.
This makes a ______________ gene available if one
becomes damaged.
Males only have one X and one Y.
Certain disorders such as color blindness are carried on
the X chromosome.
These are called sex-linked ________________.
Men are more likely to have sex-linked disorders.
GENETIC COUNSELING
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Pedigree:
SELECTIVE BREEDING
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Organisms with desired characteristics are mated to
obtain the best species.
SEX LINKED DISORDER
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