Which of the following has led to the
extinction of most of the Hawaiian
honeycreeper species?
a. destruction of habitat
b. introduction of new predators
c. introduced diseases
d. climate change
e. all of these
E
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True or false: Freshwater flatworms and earthworms are similar in that their excretory systems reabsorb electrolytes and eliminate concentrated urine
A. true B. false
During this phase of the cell cycle the microtubules of the spindle fiber attach to the kinetochore:
A. Metaphase B. Prometaphase C. Telophase D. Anaphase E. Prophase
The causative agent of whooping cough is ________.
A. Bordetella pertussis B. Campylobacter jejuni C. Bartonella henselae D. Ehrlichia chaffeensis
The mother of these progeny resulted from a cross between two flies from true-breeding lines. What are the genotypes of these two lines?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) pr cn+ / pr cn+ and pr+cn / pr+cn
B) pr+cn+ / pr+cn+ and pr cn / pr cn
C) pr+cn+ / pr cn and pr cn / pr cn
D) pr+cn / pr cn and pr cn+ / pr cn
E) More than one of these could be true.