class 13 and 14 the problem with sex I and II Flashcards Preview

BIOL 1003 > class 13 and 14 the problem with sex I and II > Flashcards

Flashcards in class 13 and 14 the problem with sex I and II Deck (12):
1

sexual reproduction

fusion of gametes to form a zygote, characterized by the gameetes that will fuse being derived from different parens and its this presence of separate - usually two - sexes that is the basis of the difficulty in explaining evolution of sex

2

costs of sex

cost of meiosis, cost of producing males

3

other costs of sex

costs of recombination, cost of mating, physiological costs of mating

4

accelerated of evolution

possible benefit to sexual reproduction - reshuffle genetic material wtihin population - uses group selection

5

group selection

individuals possess traits that serves as to maximize longetitvty of the group within which they reside - fitness differences among entire groups of individuals

6

DNA repair

individuals have way to recieve a good - non mutatnt copy of a gene, diplody common, repairs errors that arise

7

advntages of sex

accel rate of evolution, dna repair, overcoming deleterious mutations, response to environemntal heterogenity and vriation

8

overcoming deletrious mutations

may reduce accumulation of deleterious mutations by regularly combinging genetic info from another individual to rproduce offspring tat may have a good non mutatnt copy of most genes

9

response to environemntal heterogeneity and variation - two hypothesis

tangeled bank hypothesse
red queen hypothesis

10

tangeled bank hypothesis

spatially heterogenous environmetn - parent produces genetically simialr offspring at disabantage bc most offspring may not find suitable match between phenotype and environemnt

11

red queen hypothesis

temporally heterogeneous environent- parent produces genetically simialr offspring at disadvantage, role of parasites ating - evolving to constantly change biotic envirooment of an organism is ually invoked in explaitions of sex based on red queen

12

what does sex create

genetically diverse offspring

Decks in BIOL 1003 Class (57):