Male northern elephant seals (Mirounga angustirostris) are common in the northern Pacific. Which of the following features of a male elephant seal likely reflect sexual selection?
A. They have two eyes.
B. Their forelimbs are flippers.
C. Females have a uterus; males have a
penis.
D. They have a thick layer of blubber (fat)
under the skin.
E. Males are much larger than females.
E
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Structures known as microvilli are associated with:
A. communication between cells. B. increased surface area for gas exchange. C. adhesion to the extracellular matrix. D. increased surface area for nutrient absorption.
Which of the following represent repeated sequences commonly found in the human genome? (Choose all that apply)
A. several thousand base pair sequences in tandem B. several thousand base pair sequences dispersed throughout the genome C. two or three base pair sequences repeated many times in a row D. two or three pase pair sequences dispersed throughout the genome
Opening
What will be an ideal response?
Sickle-cell anemia is caused by a mutant allele of a hemoglobin gene. Individuals with two mutant alleles have sickle-cell anemia
Individuals homozygous and heterozygous for the mutant gene are more resistant to malaria than those with two wild-type alleles. Is this mutation dominant, recessive, or co-dominant?