1 / 9

Sex Determination

Sex Determination. in Mammals. Importance?. Does it has any economic role in livestock farming system? Cattle Poultry Fish Wildlife (may be). A Sequential Process. Chromosomal Sex Gonadal Sex Phenotypic Sex. Chromosomal Sex at Fertilization. Female ovum always carries - X X

kennyjones
Download Presentation

Sex Determination

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sex Determination in Mammals

  2. Importance? • Does it has any economic role in livestock farming system? • Cattle • Poultry • Fish • Wildlife (may be)

  3. A Sequential Process • Chromosomal Sex • Gonadal Sex • Phenotypic Sex

  4. Chromosomal Sex at Fertilization • Female ovum always carries - X X • Male sperm has either – X X or X Y • Y is the smallest human chromosome • Genes are involved in Gonadal differentiation SRY; Sex-determining region Y TDF; Testis determining Factor

  5. Gonadal Sex at 4th Week of Gestation • Mesoderm of urogenital ridge ---- most of the Gonadal cells • Ectodermal cells ------- primordial germ cells (gonocytes) • At 5th week Gonad has • Germ cells • Supporting cells • Stromal or interstitial Cells

  6. Embryo is Bipotential • Until 6th week could develop in male or female phenotype • Default development is female • Embryonic castration develop female • Female urogenital develop in the absence of gonads • Sertoli cells secretes • Mullerian Inhibiting hormone or Anti-Mul.Hormone • Testosterone triggers the development of external and internal genitalia

  7. Comparable Development of Genital Systems

  8. Steroidogenesis • Cholesterol • Pregnelone • Androsteneediol • Testosterone • Estradiol

  9. What is the chromosomal sex of freemartin calves? • Which factor make(s) makes a calf freemartin • Why there is the location of testis and ovary, while they have same embryonic origin?

More Related