Male northern elephant seals compete with one another for territories along the beach. Males will defend these territories throughout the breeding season
The males that win the
male–male competitions defend the "best" beaches, and will have access to mate with
females that stay on the beach. Female northern elephant seals (Mirounga angustirostris)
come up on a beach during breeding season. Different areas on the beach are defended by
a single male; when females haul-out they join a group of females in one specific area on the
beach. They disproportionately breed with the male that defends that area of the beach. At
what point may intersexual selection occur in these elephant seals?
A. when the female is swimming to the beach
B. when the female lands on the beach and
chooses her resting location
C. when the male defends his group of
females against a different male
D. when the male mates with a female within
his group
E. when the female leaves the beach after
mating with a male
B
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Fill in the blank(s) with correct word
How many proteins are present in the extract from the individual that is homozygous recessive?
a. 6 b. 7 c. 8 d. 9
In mice the allele for colored fur (C) is dominant to
the allele for albinism (c). The allele for normal behavior (W) is dominant to that for waltzing movement (w). Give the probable genotypes of the parents if they produced the offspring listed after the following crosses: (a) colored normal x white waltzer produced 10 colored normal, 8 colored waltzers, 2 white waltzers, 11 white normal (b) colored normal x white normal produced 35 colored normal, 13 colored waltzers (c) colored normal x colored normal produced 37 colored normal, 14 colored waltzers, 9 white normal, and 5 white waltzers What will be an ideal response?
All EXCEPT which of the following is true of the
spinal cord? a. houses connections between sensory and motor neurons b. serves as a reflex center c. its gray matter serves as passageway for nerve tracts to brain d. is covered with meninges e. is enclosed by vertebrae