FINAL - New Stuff Flashcards
Found that early embryonic stages of different vertebrates have features in common that they would lose later in development
Von Baer
Von Baer
Comparative Animal Development
Early in development, a human is virtually indistinguishable from:
an alligator or mouse
Embryos of _____, _______ and ______ develop _______ that are resorbed and lacking in adults
birds
anteaters
baleen whales
incipient teeth
Human embryos grow a _____ that persists as _______; some infants are born with
tail
3 fused sacral vertebrae
complete tails
wnt-3a gene, Chr 1
Gene that controls tail growth
Range of tail length’s in humans
1-12” long
As in other primates, human fetuses develop ________; normally shed before birth but sometimes present at birth
dense coat of hair (Lanugo)
Comparative animal development provides evidence for:
evolution of diverse spp. from common ancestors
Differential rate of growth of different parts or dimensions of an organisms during ontogeny
Allometric growth
Allometric growth examples:
An elephant’s tusks are incisor teeth that have grown faster and for a longer time than other teeth
Male stag beetle shows positive allometry of mandibles, relative to body size
In 1970/80’s, discovery of the ______ of ______ genes in animals marked down of modern evo-devo
Hox cluster
homeobox
Homeobox genes
Direct development of the animal from the front end all the way to the back
Homeobox genes are a class of ________ that control patterning of specific body structures
homeotic selector genes
Homeobox genes control identity of segments along _______ body axis of animals
anterior-posterior
The same “toolkit” of genes and developmental pathways are _____ in the vast diversity of organisms
conserved
Mutations in Hox genes
Homeotic mutations
Mutations in Hox genes cause ________ of one type of ______ into another
transformations
segment
Hox mutations in what spp:
drosophila
Mapping p/a of ______ on animal tree of life shows _______________
Hox genes
common evolutionary history
______ sets stage for further study of commonalities among animals in _______ patterning and limb development
Mapping of Hox genes
dorsal-ventral
Fluorescent visualization methods reveal that _______ are expressed in _____________
Hox genes
spatially restricted regions
Under normal conditions:
Antennapedia gene expressed only in first segment of thorax
Under mutated conditions:
antennapedia gene can have a gain of function mutation that causes an antenna to leg transformation
All hox genes have DNA-binding region of _________ referred to as ______
~60 amino acids
homeodomain
Regulate DNA transcription (or control development)
Turn transcription on/off or enhance suppress transcription rate
Fine tune expression of other gene products necessary for development
Roles of Hox genes
Hox gene tasks are central to ____________, so nucleotide sequence is ______ across widely divergent taxa
body plan development
conserved
Importance of common ancestry
Common ancestry informs agriculture, human health, and society through basic and applied research on bacteria to chimpanzees
Creation/Evolution continuum reflects:
Degree to which the bible is interpreted literally
Different philosophical beliefs
How much modern science is accepted?
At opposite ends of continuum are
Flat earthers
Atheistic evolution
Flat earthers
passages in bible imply earth is circular and flat; believe modern geology, physics, and astronomy are an error
Atheistic evolution
scientific theory of evolution; functions under rules of scientific method and limits explanations to the natural world. Is neither anti-religious nor pro-religious
In the US, when asked about the origin of humans, a 2005 gallup poll showed that:
53% believed God created humans in their present forms
“speciation creation”
31% believed God created humans by guiding evolution
“Theistic evolution”
12% of Americans accepted that humans evolved from non-human ancestors
“Atheistic evolution”
A state by state analysis by the Thomas B. Fordham Institute found that:
20 states earned a “sound grade” (including CA)
17 states earned a “passing” or marginal grade
13 states earned “failing grades” or worse (Kansas)
Thomas B. Fordham Institute found that teaching of evolution changed little since:
its 2000 report
How many weeks did the trial last?
6 weeks
Who is Bertha Spar?
Dover Science Teacher
Who is Bryan Rhem?
Dover Science Teacher
Who is Alan Bonsell?
School board member who proposed creationism be taught in the science class room