The tammar wallaby is one of many mammalian species that live in Australia. Like

Question

The tammar wallaby is one of many mammalian species that live in Australia. Like other marsupials, tammar wallabies are “born” as primitive embryos that develop more fully in their mother’s pouch. Males do not have pouches but rather the structure that gives rise to the pouch in females, gives rise to the scrotum, the eventual location of the testes, in males). Like placental mammals (like us), tammar wallabies and other marsupials have an XX/XY sex determination system, with XX females and XY males. Occasionally scientists have observed a tammar wallaby with XO or XXY sex chromosome constitution. XO wallabies have ovaries but no pouch; instead they have a scrotum-like structure. XXY wallabies have testes and a pouch but no scrotum.
What does this information suggest about the roles of the X and Y chromosomes in sex determination and/or fertility in tammar wallabies?

Explanation / Answer

Marsupials mammals dosage effect of X chromosome is yet more obivious because mammals with XXY and XO are intersex neither completely male nor female. Development of scortal or pouch seems to be a function of number of X chromosome. Even so Y control whether animals have a testis or not implying the marsupalis also have a dominant TDF on the Y chromosome

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