sexual reproduction HARD EDITION Flashcards
what are the 3 stages of mating
mating, fertilization, development
list things the embryo needs
moisture so it doesn’t dry out, protection from predators, nutrients
explain external fertilization
when egg and sperm meet outside of parents.
what animals usually do external fertilization
urchins, fish, and some plants
advantages of external fertilization
little energy, large numbers of babies
disadvantages of external fertilization
parents often don’t care for child leaving them defenseless, gametes usually die before meeting each other.
explain internal fertilization
when egg and sperm meet inside the female
what organisms use internal fertilization
all mammals
advantages of internal fertilization
parent(s) uselly care for baby, embryo is safe thanks to it being inside the mother
disadvantages of internal fertilization
requires more energy, also harder to find a mate.
explain pollenation
how most plants fertilize, most flowers do this by getting male gametes from bees. the bees collect the pollen from a male flower and rub it against a female flower. it then makes seeds which are often found inside flower.
what’s a blastula
main part of sperm (NOT THE TAIL)
what’s a ectoderm
outside skin part of blastula
what’s a mesoderm
middle part of blastula
what’s a endoderm
inside part of blastula
