Ch. 43 Animal Reproduction Flashcards
sexual reproduction
the creation of an offspring by fusion of a male gamete (sperm) and female gamete (egg) to form a zygote
genetic recombination
fertilization
union of sperm and eggs
internal fertilization
typically associated with production of flower gametes but the survival of a higher fraction of zygotes
gonads
organs that produce gametes
testes
the male gonads, or testes, produce sperm in highly coiled tubes called seminiferous tubules
ducts
from the seminiferous tubules of a testis, sperm pass into the coiled duct of the epididymus
during ejaculation
sperm are propelled through the mucular vas deferens and the ejaculatory duct and then exit through the urethra
semen
sperm and secretion from seminal vesicles, prostate gland and bulbourethral gland
2 seminal 70%
prostate 25%
bulbo- pre cum that cleans urethra
gametogenesis
production of gametes
spermatogenesis
development of sperm is continuous and prolific
oogenesis
development of a mature egg, is a prolonged process
immature eggs from the female embryo but do not complete their development until years or decades later
gonadotropin-releasing hormone
secreted by the hypothalamus and directs the release of FSH (follicle stimulating hormone) and LH (lutenizing hormone) from the interior pituitary
FSH and LH
regulate processes in the gonads and the production of sex hormones
menopause
after about 500 cycles there is cessation of ovulation
fertilization stage
zygote formed