| 31. | Other than bats and some two dozen indigenous rodent genera, there are no pre-human indigenous placental mammals.
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| 32. | In contrast, male placental mammals, including chromosomally stable male cats, have one X and one Y chromosome.
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| 33. | Dating to the Eocene epoch over 50 placental mammals ) also possessed an independently evolved toothcomb.
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| 34. | At Murgon evidence of a placental mammal, a Condylarth ( " Tingamarra porterorum ) ", was discovered.
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| 35. | The indisputable remains of Australian placental mammals started from the Miocene, when Australia moved closer to Indonesia.
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| 36. | Calico cats are almost always female because the placental mammals & mdash; normally have two X chromosomes.
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| 37. | There are modern genetic studies attempting to figure out the proper cladistics and taxonomy of placental mammals.
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| 38. | The platypus has an average placental mammals.
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| 39. | Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
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| 40. | SRY is a sex-determining gene on the Y chromosome in the therians ( placental mammals and marsupials ).
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