Adaptive traits are
A. favored by natural selection.
B. caused by mutation.
C. not selected from one generation to the next.
D. selected against.
E. usually recessive alleles.
Question 2
This chapter describes the case of giraffes' long necks to illustrate how natural selection works on variety within a population. This explanation contrasts with the incorrect alternative of the inheritance of acquired characteristics, which suggests that
A. in each generation, individual giraffes strain their necks to reach food just a bit higher, and that this straining somehow modifies their genetic material.
B. in each generation, individual giraffes mate with giraffes having longer necks because they are better at getting food, and their offspring's neck size results in an average of the parents' neck sizes.
C. a need for a longer neck activates the long-neck gene throughout development.
D. natural selection works on the genotype, not the phenotype.
E. the presence of variety among a population works against the advantages of natural selection.
The bithorax mutation in Drosophila
Dentition, as illustrated in Knight's Sketches in Natural History
Inflammation. Inflammation is characterized by the presence of swelling, redness, heat, and pain. Sw
Chronic disease is caused by a mixture of genetic and environmental influences
Some human traits controlled by a single gene
Familial Risks for Multifactorial Threshold Traits