________ would produce the smallest evolutionary change in a given period of time in a population of birds.
A. Migration
B. Gene flow
C. Mutation
D. Assortive mating
E. Natural selection
Answer: C
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How is the syphilis spirochete initially transmitted?
A) penetration of unbroken skin B) through the eyes C) from mother to child D) through tiny breaks in the skin epithelial layer
In the plasma membrane, the phospholipid heads
A) are hydrophilic and face outward toward the aqueous solution on both sides of the membrane. B) are hydrophilic and face inward, shielded from water. C) are hydrophobic and face outward toward the aqueous solution on both sides of the membrane. D) are hydrophobic and face inward, shielded from water.
The peripheral proteins may also function in
What will be an ideal response?
Sickle cell anemia (a serious heritable disease) appears to be maintained via balancing selection in some Af-rican populations, because heterozygous carriers for the fully recessive disease allele are less affected by ma-laria parasites
Is this a case of antagonistic pleiotropy? a. Yes, the same allele has positive effects on one trait and negative effects on another trait. b. Yes, wild-type and sickle cell alleles have antagonistic effects. c. No, there is no time lag between the two traits (i.e., as in early vs. late acting). d. No, it involves a dominance interaction between the wild-type and the sickle cell allele.