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B1 Understanding Organisms

OCR Gateway
by

Po M

on 22 August 2013

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Transcript of B1 Understanding Organisms

Biology Revision
B1 Understanding Organisms
B1a
thrombosis =
blood clot
cholesterol deposits may lead to a blood clot
causing a heart attack or a stroke
high blood pressure
smoking
stress
overweight
eating too much salt
drinking too much alcohol
eating too much sat. fat
can be caused by...
heart attack
stroke
kidney damage
can lead to...
low blood pressure
dizziness
poor circulation
fainting
can lead to...
B1b
carbohydrates
fats
vitamin C
proteins
iron
to give you energy
to prevent scurvy
to make haemoglobin
to give you energy
for growth and repair
why you need it?
stored...
in liver as glycogen
under skin and around organs as adipose tissue
NOT STORED
B1c
B1d
B1e
cigarette
this is addictive. it also increases heart rate and puts strain on the heart
reduces the
oxygen carrying
capacity of the blood so the heart has to work harder
carbon monoxide
B1h
B1g
B
B
b
BB
B
b
bb
b
B
b
the genes you inherit from your parents determine your genotype
the appearance of a specific characteristic is phenotype
but...
allele for brown eyes
B
b
allele for blue eyes
mutations produce variation
a mistake can happen when DNA is being copied before cells divide
some mutations can be caused by things in the environment
chemicals in tobacco smoke
UV radiation in sunlight
X-ray or gamma ray radiation
gametes are sex cells
they contain only 23 chromosomes
each gamete is genetically unique so fertilisation produces genetic variation
an allele is a different version of a gene
B
b
recessive allele
dominant allele - gene is expressed
Full transcript