Review Questions (paraphrased) Flashcards
What is responsible for determination of gonadal male sex in mammals?
Sex-determining region on the Y xsome (Sry)
What is the embryonic precursor of the uterus?
Paramesonephric duct (Müllerian duct)
Chromosomal sex of Klinefelter’s syndrome?
XXY
What structure prevents aspiration of fluid into the oviduct of the mare?
Oviductal papilla
What accessory sex gland is present in males of all species?
Prostate
What is the term for the 1st meiotic arrest of oogenesis?
Diplotene
Are secondary spermatocytes haploid or diploid?
Haploid
What is the role of ZP3 in fertilization process?
Binds w/ sperm to initiate acrosome reaction
What is the mare placental type?
Diffuse, epitheliochorial, non-deciduate (side-note: also has microcotyledons)
True/False: Bird egg binding occurs infrequently.
False: it’s actually a common problem
True/False: During proestrus & estrus, the bitch is attractive to the male.
True
Which animal is polyestrous, with repeated cycles throughout the entire year? A) dog B) sheep C) cow D) horse E) cat
C) cow
What occurs in metestrus?
Progesterone rising during luteal formation
What does melatonin do to mares?
Suppresses GnRH (they are long-day breeders)
What does LH cause?
Ovulation (side note: also late follicular development)
What causes vaginal cytology cornification?
Estrogen
How long post-LH surge, is the bitch most fertile?
4-6 days
What hormone is used for feline (and canine) pregnancy tests?
Relaxin
When can feline puberty occur?
As early as 4-months-old
What stage does feline ovulation occur?
Estrus
What does FSH do (in females)?
Early follicular growth.
What is the Ferguson Reflex?
Neuro-endocrine response driven by oxytocin (occurs during birth → uterine contractions) (excellent example of positive feedback loop)
