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Flashcards in Species Deck (15)
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1

WHich is the most objective taxon

species

2

Mammalia

mammals

3

aves

birds

4

reptilia

reptiles

5

amphipia

amphibians

6

agnatha

jawless fishes

7

chondrichthyes

cartilaginous fishes

8

osteichthyes

bony fishes

9

BIRDS ARE

REPTILES

10

Reproductive isolation

when groups can no longer exchange genes

a key factor in the divergence of sexually reproducing organisms.

11

Biological species concept

Groups of actually or potentially interbreeding populations that are reproductively isolated from other such groups

does not refer to organisms that reproduce asexually

12

morphological species concept

Linnaeus described species based on their appearance

Members of species look alike because they share many alleles.

13

Townsend's and Hermit warblers

Hybrids inherit specific-specific mtDNA sequences from their mothers

Most Townsend’s-hermit warbler hybrids have hermit warbler mtDNA

In areas of overlap most Townsend’s warblers maintain their territories and hermit warbler males are most likely to abandon their territories.

14

Dung beetles

origin of dung beetles occurred in the middle of the Cretaceous, likely in association with dinosaur dung, and with the rise of the angiosperms.

switch in dinosaur diet to incorporate more nutritious and less fibrous angiosperm foliage provided a palatable dung source that ultimately created a new niche for diversification.

At the end of the Cretaceous the loss of dinosaur dung, led to major dung beetle extinctions.

15

T1R2 gene

Most birds lack an essential subunit (T1R2) of the only known vertebrate sweet receptor.

The ancestral umami receptor (the T1R1-T1R3 heterodimer) was repurposed in hummingbirds to function as a carbohydrate receptor.

Changing taste receptor function enabled hummingbirds to perceive and use nectar, facilitating the massive radiation of hummingbird species.