asex sexual repreduction Flashcards
What is Asexual Reproduction?
The formation of a new organism from only one parent.
What is Budding?
(e.g. of yeast and hydras) occurs when a small part of the parent’s body separates from the rest and develops into a new individual
What is Binary Fission?
(e.g. of bacteria and Amoeba) when a cell replicates to form 2 new ‘daughter’ cells.
What is Fragmentation?
(e.g. of flatworms and starfish) occurs when a parent body is broken into pieces, and each piece may form a new individual.
What is Spore Formation?
(e.g. of ferns) occurs where special cells with resistant coverings form.
What is Parthenogenesis?
(e.g. of bees, wasps) occurs when a new organism develops from an unfertilised egg.
What are Runners or Regeneration?
(e.g. of many plants) occurs when part of an organism grows to form other organisms. Examples of regeneration in plants are the vegetative propagation of runners of grasses and strawberries, rhizomes in ferns, tubers in potatoes.
What are the male sexual parts of a flower?
The stamen consists of the anther with pollen and filament.
What are the non sexual parts of a flower
Sepals and Petals
What are the main parts of the human male reproductive system?
The testes, epididymis, the urethra and penis.
What are the female parts of the flower?
The pistil consists of the sticky stigma, the style (a long tube) and the ovary with ovules
angiosperms
Plants that reproduce sexually
What are the main parts of the human female reproductive system?
The ovaries, fallopian tube, womb, cervix and vagina.
Pollination
Pollination occurs when pollen grains reach the stigma
Pollen tube
Pollen grains landing on the sticky stigma develop a long “pollen tube” reaching down the style to the ovule
Pollen Gamete
When the pollen tube reaches the ovule the male gamete moves down the tube to fuse with the ovum and produce a zygote
Zygote
the fusing of the male gamete with the ovum produces a zygote which develops into a seed
Endosperm
the food covering around a plant embryo
Germination
the process of a seed growing into a plant
scrotum
the bag of skin caontaining the testes
testes function
produce male sex cells (sperm)
Sperm ducts function
the sperm pass through the sperm ducts and mix with fluids to form semen
Penis function
passes urine and semen out of man’s body
urethra function
tube carrying semen and urine
ovaries function
the ovaries contain the egg cells or ova
fallopian tubes
the egg tubes which carry the eggs releaved from the ovaries to the uterus
uterus or womb function
a muscular bag where the foetus develops
cervix function
a ring of muscle at the lower end of the uterus which keeps the baby in the womb
vagina function
the vagina receives the the sperm during fertilisation
urethra female
the urethra carries urine and is not connected to the vagina
