What Is A Male
Upcoming SlideShare
Loading in...5
×
 

What Is A Male

on

  • 639 views

 

Statistics

Views

Total Views
639
Views on SlideShare
639
Embed Views
0

Actions

Likes
0
Downloads
9
Comments
0

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

What Is A Male What Is A Male Presentation Transcript

  • What is a male
    • Genetic basis
    • Gonadal basis
    • Structural basis
  • Genetic basis
    • Egg contributes an X
    • 23 chromosome pairs
    • Female is XX –both sex chromosomes same
    • Sperm gives a Y or an X
    • 23 chromosome pairs
    • Male has X and Y
    • Sex of child determined by the “dad”
  • division
    • All body cells have 46 chromosomes
    • Sex cells ( sperm or egg) have only 23
    • During development of sex cells, division occurs (meiosis)  only 23 chromosomes
  •  
  • Male vs. female
    • Autosomes same (22 ) pairs
    • Sex chromosomes not same
    • Major differences on the “Y” chromosome
    • SRY segment
  • SRY
    • Responsible for testes formation
    • Testosterone production
    • Sex characteristics
    • Sperm function
  • The Gonadal Basis Gonads give a sexual identity Males testes develop at week 7 Ovaries at week 12
  • Structural Basis
    • Before 6 weeks embryo has possibility to become either sex.
    • Mullerian ducts  fallopian tubes/ uterus
    • Wolffian ducts  sperm making ducts
  • Female is the default model
    • Testes, if present  androgenic hormones and MIS ( mullerian inhibiting substance)
    • Also, 5 alpha reductase changes testosterone into DHT, another form of testosterone
    • T, MIS and DHT are responsible for making a male and female structure deterioration.
    • Receptors respond to these chemicals  male organ and physiology
  • Female
    • In absence of T, MIS or DHT…………….a female
    • Forms initially.
    • Y SRY sperm production
    • Testosterone male ducts
    • MIS mullerian duct disintegrate
    • proteins to regulate dna