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32 Cards in this Set
- Front
- Back
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sexual reproduction
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advantage: reproduction using 2 parents giving an offspring that isn't exactly like the parents. disadvantage: You need 2 parents.
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asexual reproduction
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advantage: You only need 1 parent
disadvantage: There is no variety |
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fertilization
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what is it? it is when the sperm meets the egg.
where dose it happen? it happens in the uterus. |
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compare internal and external fertilization
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internal fertilization is much safer for the offspring because it is in the mother. external fertilization is more dangerous for the offspring because it occurs outside the mother
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where does the human fetus develop?
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in the uterus
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umbilical cord
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the cord that gives the fetus food and air
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amniotic sac
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the sac in the uterus that "cushions" the fetus
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male hormone
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testosterone
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female hormone
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estrogen
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how old is earth?
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4.6 billion years
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what is a fossil?
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a fossil is an "outline" of an animals bones in a sedimentary rock
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what types of body parts usually make fossils?
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the bones
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what was the probable cause of the dinosaur extinction.
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they evolved into birds and other mamals
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what determines when new periods begin?
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when a new rock layer forms.
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what is Pangaea?
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Pangaea is when all the continents were one continent.
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who is Charles Darwin?
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he is the guy who discovered that man evolved from monkeys.
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explain why a species might go extinct
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it might adapt differently to a new environment.
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what is overpopulation?
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it is when there is too much of one species.
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Gregor Mendel
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a priest that figured out genetics using pea pods
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how many chromosomes are in a human body cell?
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46
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how many chromosomes are in a human sex cell?
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23
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how many genes do you have for one trait?
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2, dominant and resistive
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genes
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the traits you get from your parents.
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DNA
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a long term storage of info
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chromosomes
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an organized structure of DNA and protein
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dominant trait
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a trait that is usually more likely to show in the offspring
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resesive trait
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a trait that is usually more likely to not show in the offspring.
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genotype
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the genetic constitution of a cell
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phenotype
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the trait of an organism
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what is a punnett square
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a square that determines the probability of having a certain gene.
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what is a pedigree?
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a chart used to record ancestry
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what is a genetic disease?
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HIV
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