Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
chromosome sex determination
|
mammals -> 2nd x or Y
birds -> reverse mammal situation, zz male, zw female flies -> ratio of x chromosome to autosome bees -> haploids-male, diploids-female |
|
sex chromosome abnormalities female
|
turner syndrome-> xo
meta females -> xxx superfemales -> xxxx... |
|
sex chromosome abnormalities male
|
klinfelter syndrome -> xxy
supermale -> xyy |
|
differentiation into male
|
sertoli cells -> testis cords -> extend deep into connective tissue -> form internal network s of sex cords and thin rete testis -> lose contact with surface epithelium -> separated by thick extracellular matrix -> become tunica albuginea
|
|
primary sex determination
|
determination of gonads
strictly chromosomal no environment |
|
testis-determining factor
|
organizes gonad into testis rather than ovary
|
|
secondary sex dtermination
|
phenotype outside the gonads
determined by hormone |
|
developing gonads
|
usually organ primordia only develop into one organ type
not true for gonads -> can develop into either ovary or testis bipotential stage -> neither male or female |