ANSC 333 Exam 2 (1

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ANSC 333 Exam 2 (1

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Exam of 12 pages for the course 333 - Exam 2 at 333 - Exam 2 (ANSC 333 Exam 2 (1)

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ANSC 333 Exam 2
How is sex determined genetically? - ANS-XX = female
XY =male

How is sex determined phenotypically? - ANS-vagina or penis

How is sex determined gonadically? - ANS-testes or ovaries

5 stages of sexual differentiation - ANS-Development of the indifferent gonad
Differentiation of the gonad
Differentiation of the internal genital organs
Differentiation of external genitalia
Development of secondary sex characteristics

When does development of the indifferent gonad take place? - ANS-early embryo

When does differentiation of the gonad take place? - ANS-late embryo

When does differentiation of the internal genital organs take place? - ANS-late embryo
to fetal

When does differentiation of the external genitalia take place? - ANS-fetal

When does development of secondary sex characteristics take place? - ANS-puberty

Mesonephros - ANS-acts as kidney in early embryo

Metanephros - ANS-functional kidney in adult

Mesonephric duct - ANS-Makes male tract

Paramesonephric duct - ANS-make female tract

Where do primordial germ cells originate? - ANS-in the yolk sac

Where do primordial germ cells migrate? - ANS-towards the gonadal ridge

What two things can primordial germ cells become? - ANS--spermatogonial stem cells

, -egg nests

Yolk sac - ANS-provides nutrients to embryo

Allantois - ANS-collects embryos waste

Who used rabbits to learn about differentiation of the gonad? - ANS-Jost

What was learned from Jost experiments? - ANS-Female tract is default

Differentiation of gonads male development - ANS--SRY gene contains testes
determining factor (TDF)
-Testes develop
-Sertoli cells secrete anti-mullerian hormone (AMH)
-This causes paramesonephric duct to regress
-AMH causes leydig cells to differentiate into testosterone
-Testosterone cause male tract to develop
-5a reductase converts testosterone to dihydrotestosterone
-dihydrotestosterone causes penis scrotum and accessory glands to develop

Undifferentiated sex chords becomes what? - ANS-testes or ovaries

What is another name for the mesonephric duct? - ANS-Wolffian duct

What does mesonephric tubules become in adult male? - ANS-epididymis

What does mesonephric duct become in adult male? - ANS-vas deferens

What do rete tubules become in adult male? - ANS-rete testes

Differentiation of gonads female development - ANS--No TDF from SRY gene
-ovaries develop as default
- no testosterone means mesonephric ducts regress
- no AMH means paramesonephric ducts become oviducts, uterus, cervix and anterior
vagina

Puberty - ANS-When an animal is able to reproduce, hypothalamus and GnRH centers
are developed

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Study: 333 - Exam 2
Uploaded on: June 2, 2024
Number of pages: 12
Written in: 2023/2024
Type: Exam (elaborations)
Contains: Questions & answers

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