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A variety of such regulatory mechanisms have been described so far and …

Biology Articles » Zoology » Molecular patterns of sex determination in the animal kingdom: a comparative study of the biology of reproduction » Tables

Tables
- Molecular patterns of sex determination in the animal kingdom: a comparative study of the biology of reproduction

Table 1

Sex reversal

Female-producing temperatures
 Male-producing temperatures
XX (ZW)
 Female (in accordance with genotype)
 Female OR male (in discordance with genotype)
XY (ZZ)
 Male OR female (in discordance with genotype)
 Female (in accordance with genotype)

The combination of genotypic and temperature-dependent sex determination allows a phenomenon known as sex reversal, where the phenotypic sex does not always agree with the genotypic directions.

Manolakou et al. Reproductive Biology and Endocrinology 2006 4:59   doi:10.1186/1477-7827-4-59

Table 2

Different aspects of sex differentiation in marsupials

Y chromosome (testes)
 No Y chromosome (absence of testes)
One X chromosome (scrotum)
 XY
 XO

Male animals with scrotum and testes
 Animals without testes and an empty scrotum instead of a pouch
Two X chromosomes (pouch and mammary glands)
 XXY
 XX

Animals with testes and a pouch with mammary glands instead of scrotum
 Female animals with a pouch and mammary glands

The marsupial Y has the ability to turn the undifferentiated gonads into testes, but other aspects of sex differentiation seem to rely on the number of X chromosomes present. This is how we come across the above combinations in sex chromosome aneuploidies in marsupials.

Manolakou et al. Reproductive Biology and Endocrinology 2006 4:59   doi:10.1186/1477-7827-4-59

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