Lecture 25 - Reproduce Flashcards
1
Q
Asexual vs sexual reproduction
A
Asexual
- > single parent produces offspring
- > animals: budding, fission, fragmentation, parthenogenesis
- > plants: fragmentation, apomixis
Sexual
- > two parents who produce genetically unique offspring
- > dioecious
- > hermaphroditic, moneicious
2
Q
hermaphrodites
A
- > probably most common among angiosperms
- > hermaphrodites produce both gametes, possibly simultaniously, and can self fertilize
- > “selfing” not asexual since fertilization occurs (possible but rare)
3
Q
explain monogomy, polygyny and polyandry
A
monogomous species
- > one female, one male
polygynous species
- > one male, many females
polyandrous species
- > one female many males
*polygamous (both polygynous and polyandrous) species are dimorphic, showy, ornamental one is outnumbered and monogomous species typically look the same*
4
Q
semelparous
A
reproduce once before senescence (the condition or process of deterioration with age)
- > annual pattern (some plants and insects) or over several years (salmonids)
- > also know as the “big bang” of reproduction
5
Q
iteroparous
A
capable of breeding more than once
- > plants: long time spans and reproduce around once a year after juvenile phase
6
Q
Biotic vs abiotic vectors
A
Abiotic vectors
- > the non-living processes of pollen movement (i.e. wind)
Biotic vectors
- > living processes of pollen movement (i.e. insects, or birds)
7
Q
Evolutionary consequences of breeding once vs breeding frequently
A
Once = risky
- > invests all resources at expense of self
Frequently = less risk
- > produce fewer offsprings per event than closely related semelparous organisms
- > maintain resources for own survival
8
Q
_____________ is favoured if odds of surviving (parent or offspring) are low
A
semelparous
