reproduction Flashcards
reproduction
the process by which members of a species produce offspring
sexual reproduction
involves fusion of 2 sex cells (gametes)
asexual reproduction
not involve sex cells
- offspring are genetically identical to one another and parent
how many human diploid and haploid cells
diploid = 46 chromosomes
has double set of chromosomes
haploid= 23 chromosomes
single set of chromosomes
anther
produces pollen which contains male gametes
petal
brightly coloured which attracts insects
stigma
where pollen grains attach
style
where pollen tubes grow
ovary
produces ovules which contain female gametes
sepal
protect unopened flower
filament
hold anther in position for pollination
stamen
collective for male parts of flower
pollination
transfer of pollen grains from anther to stigma
fertilisation
fusion of nucleus of male gamer (haploid) with the nucleus of female games (haploid) to form zygote (diploid) which divides to form embryo
male reproductive system:
1. testes
2. sperm duct
3. penis
4. urethra
- produces sperm
- carries sperm from testes to penis
- inserted into vagina during copulation and deposits sperm
- tube where sperm leaves body
female reproductive system:
1. ovary
2. oviduct
3. uterus
4. vagina
- produces ova (female gametes)
- carries ova from ovary to uterus and is site of fertiliasation
- embryo implants here and develop into fetus
- penis inserted during copulation, exit canal for birth
stages between fertilisation and implantation
- ovum released from ovary
- sperm swim towards ovum
- 1 sperm fertilise 1 ovum
- zygote divides
- cells continue to divide to form blastocyst
- blastocyst divides and moves in uterus
- blastocyst implants in wall of uterus
- implantation of blastocyst completed
