science inheritence and selection Flashcards
what is variation?
the difference between organisms
examples of genetic variation?
natural eye colour
inherited deseases
blood type
natural hair colour
examples of enviromental variation?
tattoos
peircings
accent
skin tone
what is fertilsation?
the fusion of the nuclei of sperm and egg
whats different about sex cells?
there are 23 chromosomes in each
whats the proper name for sex cells?
gametes
what are the names of the sex cells in plants and animals?
plants-egg,pollen
animals-sperm,egg
why does the off spring look diff to their parents?
because its genes are 50% of each parent
whats the female part of a plant called?
stigma+style=carpel
whats the male part of a plant called?
anther+filiament=stamen
how does pollen get to the female parts of the plant?
the wind or bees
what happens after the fertilisation of plants?
pollen tube to ovaries,pollen grain fertilises eggs
whats genetic modification?
artificially putting new genes into an organism
what does ‘GMO’ stand for
genetic modified organism
what’s selective breeding?
producing different breeds with useful characteristics
whats sexual reproduction?
the fertilisation from the sperm and the egg
what happens days 1-7 of the menstrual cycle?
the lining if the uterus breaks down and is lost in the vagina
what happens days 14-21 of the menstrual cycle?
the uterus lining is thick and spongy ready to recieve the egg
how long can an egg live for?
up to 5 days
what happens in day 14 of the cycle?
ovulation-egg is released from the ovary into the oviduct
what happens days 8-14 of the cycle?
uterus lining is being repaired and getting thicker
how many days is the cycle all together?
28days
where is DNA found?
in the nucleus
where are our genes found?
in the nucleus
why do we all look different?
because of our genes
