reproductive biology Flashcards
1
Q
photoperiod
A
change in environment based on light and dark cycles
melatonin profiles mirror this –> low during day and high at night, also seasonal element
2
Q
human vs sheep photoperiod changes
A
sheep show clear durational responses to photoperiod - if change photoperiod to mimic seasons so essentially 1yr in 6mo, they will come into season twice that year
humans show a phase delay in photoperiod, rather than longer period of elevated melatonin
3
Q
sex determination
A
determined by male - if they give X or Y
genetic sex (XX/XY) determined gonadal sex which determined phenotypic sex
4
Q
androgen insensitivity system
A
marked phenotype in males
intra-abdominal testes that don’t produce sperm
no uterus, periods etc
appear female
