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BMS 430 EXAM 3 | 161 QUESTIONS | WITH ALL PASSED SOLUTIONS!!
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BMS 430 EXAM 3 | 161 QUESTIONS | WITH ALL PASSED SOLUTIONS!!
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BMS 430 EXAM 3| 161 QUESTIONS
| WITH ALL
PASSED
SOLUTIONS!!
Evatee 8/9/24 BMS 430
,BMS 430 EXAM 3 | 161 QUESTIONS | WITH
ALL PASSED SOLUTIONS!!
What is different about birds genetic sex? Answer - XX is male
XY is female
What is different about the genetic sex of fish? 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? Answer - SRY gene
Testosterone---->DHT by Answer - enzyme 5 alpha reductase
Testosterone---->estradiol by Answer - aromatase enzyme
PDG Answer - are stem cells in the gonads
What is the SRY gene? Answer - Sex Reversal Y gene
AKA as TDF (testis determining factor)
How does the SRY gene differentiate gonads? 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? Answer
- MIF - mullarian-inhibiting factor
Causes the mullerian duct regression
What do the Leydig cells produce under the influence of the SRY gene? Answer
- Testosterone
- development of Wolffian ducts
(Vas deferens, seminal vesicles, epidymis)
- DHT >> penis and scrotum development
What duct is preprogrammed to develop? Answer - Mullerian
What hormone masculinizes the brain? Answer - estradiol
What protein in females prevents estradiol from crossing the BBB and
masculinizing the brain? Answer - alpha fetoprotein produced by the liver
binds and degrades estradiol
Why can male brains be masculinized? 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? Answer -
Pulse generator
Aggression center
Libido center
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