science 9 test
what r 3 characteristics of life
living things are compsed or cells
living things have DNA
living thibgs grow and develope
groups of living thibgs evolve over time
what r 3 statments of cell theory
all living organisms are compsed of one or more cells
the cell is the basic unit of life
cells arise from pre-existing cells
list the stages of mitosis (PMAT)
interphase
prophase
metaphase
anaphase
telophase
cytokinesis
explain interphase
happens before mitoesis \ does normal cell things
explain prophase
cromozones condence and become visible
explian metaphase
cromozones line up in the middle of the cell
explain anaphase
the sister cromatids split up
explain telaphase
daughter cells start to form and the bew cells have nucleuses
Explain cytokinesis
happens when telophase does
what is binary fission
splitting of an organism into two nee organisms that are approximately the same size
what is budding
when a bud forms on an organism, grows, and eventually breaks away
what are spores
small reproductive cells tgay can grow into a new organisms, without fertilization
what os fragmentation
when organisims can be broken or cut in two and the two segments will become indiviguals
what is meristem
a tissue in plants containing undifferentiayed cells. these tissues cab be separated from the og plant and become new organisms
how many chromosomes does the human zygote have
46
23 from mom
23 from dad
whats the difrence between haploid and diploid cells
haploid - cells contain one set of chromosomes
diploid - cells contains two setd of chromosomes
what r the goodand bad things abt asexual reproduction
good
quick
lits of offspring
dont need a partner
bad
no genetic diversity
prone to extinotion
no adaptation
whatcr the good and bad thinga abt sexual reprduction
good
allows for genetic veryation
helps natural selection
faster evolving
Bad
slow
fewer offsprings
have to have a mate
what is the diffrence between angiosperms and gymnosperms
angiosperms - fruit and flowering plants
gymnosperms - cone bearing plants
what r the 4 bases that make DNA
A=T
T=A
C=G
G=A
what r 3 GMO crops
potato
canola
corn
squash
what r good and bad things abt GMOs
GOOD
grow faster
get rid of pasts and diseases
BAD
lnag term heath care effects
cross contamination
how was dolly the sheep cloned
they Took the nucleus from the circuit donor, then took the egg cell from the donor sheep. Fused them together by electric shock. Then the cell begins dividing and turning into an embryo embryo is then placed into the uterus of the foster mother, and then it develops into the sheep.
what is CRISPR-Cas9
CRISPR-find the bad DNA and takes a snapshot to remember
Cas9- an enzyme that can cut apart DNA