Question: how many chromosomes would there be in a tammar wallaby egg cell?
Answer: The first such study used chromosome paints derived from 3 Australian species of the order Diprotodontia: the tammar wallaby (Macropus eugenii, 2n = 16), the brushtail possum (Trichosurus vulpecula, 2n = 22) and the long nosed potoroo (Potorous tridactylus, 2n = 12,XX female: 2n = 13,XY1Y2 male).