reproduction Flashcards
(21 cards)
what does fertilisation involve
he fusion of a male and femle gamete to produce a zygote
what is sexual reproduction
the process involving the fusion of nuclei of 2 gametes to form a zygote which produces genetically different offspring
how many parents needed in sexual reproduction
2
gametes are produced how in sexual reprouduction
meiosis
after fertilisation, how does the offspring develop in sexual reproduction
through mitotic cell divisions
is sexual reproduction a fast or slow process
slow
what is asexual reproduction
the process resulting in genetically identical offspring being produced from one parent
are there gametes or fertilisation in asexual reproduction
no
how many parents needed for asexual reproduction
1
in asexual reproduction, offspring are
clones
asexual reproduction is (speed)
much quicker and efficient
asexual reproduction happens in most
plants
what does the lack of genetic variation mean in asexual reproduction
they’re at a survival disadvantage because they’re more vulnerable to disease or environmental change
asexual reproduction happens by
mitosis
what are gametes
sex cells produced by meiosis
what are the human sex cells (2)
sperm -M
ovum -F
what are the plant sex cells (2)
pollen grain -M
ovule - F
how many chromosones do gametes contain
half he number of a normal human (23)
what are the adaptations of sperm for increased chances of succesfull fertilisation
has tail to propel and lots of mitochondria for energy
what are the adaptations of egg cells for increased chances of succesfull fertilisation
energy stores within the cytoplasm for early embryo development
what happens after fertilisation
the zygote divides by mitosis to develop into an embryo and the cells start to become specialised
