mammal evolution mammals - laramie, wyoming · mammal evolution mammals . the bottom of the ocean...
Post on 17-Jun-2018
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The bottom of the ocean is a nearly constant temperature. Hence, sea cucumbers living at the bottom of the ocean are BEST characterized as:
a. ectothermic homeotherms b. ectothermic poikilotherms c. endothermic homeotherms d. endothermic poikilotherms
-lactose intolerance is a genetically determined trait -It has simple Mendelian genetics (tolerance is dominant, intolerance is recessive). -Lactose intolerance is the ancestral condition in humans -Lactose tolerance evolved twice in humans, why?
LDC=lactose digestion capacity
LDC = lactose digestion Capacity, so low LDC ~ lactose intolerant
Mammals can be divided into three large groups:
1) The monotremes (lay eggs, found only in Australia and New Guinea).
2) The marsupials (or Metatheria)
3) The Eutherians (or placentals)
Monotremes are oviparous (they lay a leathery egg).
Platypus possess a spur connected to a venom gland and a rubbery bill with thousands of touchsensitive and electro-sensitive receptors.
Choose the INCORRECT association:
a. amphibians – tetrapods b. reptiles – amniotes c. lancelets – chordates d. lampreys - jawed vertebrates e. birds- bony vertebrates
Some freshwater snails are brooders; they give live birth to offspring that are nourished inside a brood sac with yolk. These snails are best described as:
a. Viviparous b. Aviparous c. Oviparous d. Vivoviparous e. Ovoviviparous
Marsupials (≈270 species)
≈70 species ≈200 species
virginia Opposum
Feathertail glider
water opposum bandicoot
wombat
gray kangaroos
koala
Sugar glider Tasmaniand devil
honey possum
The Eutherians (placentals)
complete their embryonic development within the uterus and are joined to their mothers by the placenta
Whales are embedded within the even-toed ungulates. This makes the Artiodactyla? a. Aphyletic b. Monophyletic c. Paraphyletic d. Polyphyletic
Recent fossil evidence shows that the ancestors of whales were aquatic deer!
Whales are embedded within the even-toed ungulates. This makes the Artiodactyla?
Paraphyletic! (unless you want to refer to Whales as ungulates!)
Recent fossil evidence shows that the ancestors of whales were aquatic deer!
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