Oct 23 Flashcards Preview

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Flashcards in Oct 23 Deck (15):
1

According to Haldane, which is more
susceptible to X-linked deleterious mutations?
a) parental males (XX)
b) hybrid males (XX)
c) hybrid females (XY)

c) hybrid females (XY)

2

TRUE/FALSE
Sympatric speciation is often preceded by rapid or immediate reproductive barriers

TRUE

3

Which does not present a barrier to reproduction
between two sympatric, recently diverged species?
a) night vs. day activity
b) incompatible genitalia
c) colocalization
d) distinct diets

c) colocalization

4

Two morphologically distinct frogs of unknown relationship. Distinct songs but will mate with the other species if the conspecific song is played. Hybrids have reduced fitness. Would you expect that many or few genes affect mating songs?

FEW

5

What is the central dogma?

DNA-->RNA-->protein

6

What finding upset the central dogma?

RNA-->DNA via reverse transcriptase

7

What did the Miller-Urey experiment show?

prebiotic conditions could produce 20 amino acids

8

What is believed to be the precursor to RNA?

peptide nucleic acids

9

Why is RNA predicted to be the earliest genetic material?

1) present in many of the oldest (slowest evolving) and critical cellular processes
2) RNAs can polymerize in the presence of clay
3) high local concentrations speed assembly

10

Why RNA-->DNA?

DNA is more stable than RNA-->lower mutation rate-->larger genomes-->more info.

11

Why is DNA more stable than RNA?

deoxyribose is less reactive
double strands protect info. from reacting
DNA rep. has proof-reading system
double strands have error correcting mechanism

12

Cell compartmentalization leads to what?

increases the likelihood of more replicative cycles, more quickly

13

How do fatty acids assemble to make a cell?

micelles and vesicles

14

Low local concentrations of RNA, nucleotides and their precursors in cells lead to...

less frequent RNA synthesis or specific replication

15

What are protocells?

Fatty acid-compartmentalized, self-replicating nuclear material