You are looking at sonograms and are observing fetal bones. During a 6-week-old fetus sonogram you observe
A. calcified cartilage in the long bones.
B. cartilage in the long bones.
C. compact bone in the long bones.
D. spongy bone in the long bones.
E. a lack of bone structure.
B. cartilage in the long bones.
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Let P = purple flowers and p = white, and T = tall plants and t = dwarf. If the upper case letters represent the dominant alleles, what is the phenotype of a plant with the genotype PpTt?
A. purple flowers, tall B. purple flowers, dwarf C. white flowers, tall D. white flowers, dwarf E. pale purple flowers, intermediate height
A population of mostly ____ individuals with a ____ generation time and a ____ proportion of females is expected to
show the most growth in the future.
a. prereproductive; short; high b. reproductive; short; low c. reproductive; long; low d. postreproductive; long; low e. prereproductive; short; low
Why do early successional stages harbor many r-selected species?
a. they often require shade b. they are long-lived c. they are not damaged by disturbances d. they produce many small seeds that colonize open areas e. they grow slowly
The polymerase chain reaction (PCR) uses ________, nucleotides, and a heat-resistant DNA polymerase to rapidly
increase the number of molecules of a DNA fragment. Fill in the blank(s) with the appropriate word(s).