Science-7

Front 1

estrogen

Back 1

a hormone that triggers the development of some adult female characteristics.

Front 2

oviduct

Back 2

ovaries located near them-2 oviducts. passagways for eggs. place wherre fertilization usaully occurs. EACH MONTH ONE OF THE OVARIES RELEASES A MATURE EGG WHICH ENTERS THE NEAREST OVIDUCT--oviduct leads to the uterus [womb]

Front 3

uterus

Back 3

hollow muscular organ about the size of a PEAR

Front 4

vagina

Back 4

muscular passageway leading to the outside of the body-[birth canal]

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menstrual cycle

Back 5

the monthly cycle of changes taht occurs in the female reproductive system. DURING IT, AN EGG DEVELOPS IN AN OVARY. AT THE SAME TIME THE UTERUS PREPARES FOR THE ARRIVAL OF A FERTILIZED EGG.

Front 6

ovulation

Back 6

about halfway through a typical cycle, the mature egg is released from the ovary into an oviduct.

Front 7

menstruation

Back 7

if the egg is not ferilized, it begins to break down. the lining of the uterus also breaks down. the extra blood and tissue of the thickened lining pass out of the body through the vagina.

Front 8

embryo

Back 8

[begininning stages of zygote] next 8 weeks or so, the developing human is called an embryo.

Front 9

amniotic sac

Back 9

fluid filled sac. [surounds the baby] the fluid cushions the baby

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placenta

Back 10

the link between the developing embryo and the mother.

Front 11

umbilical cord

Back 11

a ropelike structure that forms between the embryo and the placenta. contains blood vessels...

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fetus

Back 12

for the 9th week of development until birth, the embryo is called a fetus.

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adolescence

Back 13

the state of development when chidren become adults physically and mentally.

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puberty

Back 14

the period of sexual development in which the body becomes able to reproduce.

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mitosis

Back 15

the stage durning which the cell's nucleus divides into two new nuclei [produces body cells]

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chromosome

Back 16

doubled rod of condensed chromatin

Front 17

DNA

Back 17

is the geneticmaterial that carries information about an organism that is passed from parent to offspring. the info dierects all of the cell's functions.

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traits

Back 18

physical characteristics

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heredity

Back 19

the passing of traits from parents to offspring

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purebred

Back 20

a purebred plant is one that always produces offspring with teh same form of a trait as the parent

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genes

Back 21

the factors that control traits

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alleles

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different forms of a gene

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dominant allele

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one whose trait always shows up in the organism when the allele is present.

Front 24

recessive allele

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is covered up whenever the dominant allel is present

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hybrid

Back 25

things that have 2 different alleles for a trait

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probability

Back 26

the liklihood that a particular event will occur

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punnett square

Back 27

a chart that shows all the possible combinations of alleles that can result from a gentetic cross.

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phenotype

Back 28

its physical appearance or its visible traits.

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genotype

Back 29

genetic makeup or allele combinations.

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homozygous

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an organism that has 2 identical alleles for a trait

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heterozygous

Back 31

an organism that has 2 different alleles for a trait

Front 32

cystic fibrosis

Back 32

genetic disorder in which the body produces abnormally thick mucus in the lungs and intestines

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sickle-cell disease

Back 33

genetic disorder that affects blood and the production of hemoglobin

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hemophilia

Back 34

genetic disorder where a person's blood clots very slowly or not at all. people with this can bleed to death from a minor cut or scrape.

Front 35

huntingtons disease

Back 35

genetic disorder that causes the gradual breakdown of cells in the brain, leading to death

Front 36

down syndrome

Back 36

genetic disorder where people have a distinctivce physical appearance and mental retardation

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clone

Back 37

an organism that is genetically identical to the organism from which it was produced

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karotype

Back 38

a picture of all the chromosomes in a cell [doctors tool]

Front 39

amniocentesis

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a procedure to determine whether the baby will have some genetic disorders. doctors use a very long needle to remove a small amount of the fluid that surrounds the developing baby.

Front 40

fertilization takes place after what?

Back 40

OVULATIONN