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BMS 430 Exam 3 Questions And Answers
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BMS 430 Exam 3 Questions And Answers
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BMS 430 Exam 3 Questions AndAnswers
What is different about birds genetic sex? -
correct answer ✅XX is male
XY is female
What is different about the genetic sex of fish? -
correct answer ✅Can be either (XX or XY) depending on species
Sometimes determined by temperature
Some have the ability to switch
What gene does the Y chromosome carry which is important in sex
differentiation? -
correct answer ✅SRY gene
Testosterone---->DHT by -
correct answer ✅enzyme 5 alpha reductase
Testosterone---->estradiol by -
correct answer ✅aromatase enzyme
PDG -
correct answer ✅are stem cells in the gonads
,BMS 430 Exam 3 Questions And
Answers
What is the SRY gene? -
correct answer ✅Sex Reversal Y gene
AKA as TDF (testis determining factor)
How does the SRY gene differentiate gonads? -
correct answer ✅Turns on Sox 9, a box set of genes which influences
sertoli and leydig cells to differentiate the gonads into testis
What do the Sertoli cells produce under the influence of the SRY gene?
-
correct answer ✅MIF - mullarian-inhibiting factor
Causes the mullerian duct regression
What do the Leydig cells produce under the influence of the SRY gene? -
correct answer ✅Testosterone
- development of Wolffian ducts
(Vas deferens, seminal vesicles, epidymis)
- DHT >> penis and scrotum development
What duct is preprogrammed to develop? -
correct answer ✅Mullerian
, BMS 430 Exam 3 Questions And
Answers
What hormone masculinizes the brain? -
correct answer ✅estradiol
What protein in females prevents estradiol from crossing the BBB and
masculinizing the brain? -
correct answer ✅alpha fetoprotein produced by the liver binds and
degrades estradiol
Why can male brains be masculinized? -
correct answer ✅Testosterone isn't bound by alpha fetoprotein so it
crosses the BBB, attaches to receptors and is converted into estradiol
Once masculinized, the male brain converts into what three parts? -
correct answer ✅Pulse generator
Aggression center
Libido center
Describe the pulse generator -
correct answer ✅- releases GnRH in pulses 90 min
- negative feedback from:
progesterone
estradiol
testosterone
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