Developmental Biology UW lec 8 Flash Cards

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Title: Developmental Biology UW lec 8
Description: flashcards for the developmental biology class offered in uw in fall 2008
Number of Cards: 8
Save Count: 0
Author: forest2087
Created: 2008-11-26
Tags: biology developmental uw
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    • Question
    • Answer
    • Side 3
    • 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