Biology Honors EHS Ch 16-20 Study Questions

What allows populations to adapt to new environments? 

• Variation
• Genetics
• Extinction
• Competition

The frequencies of 4 alleles of a trait would add up to:

• 100
• 100%
• 25%
• 25

Which of the following is NOT a source of variation of alleles?

• Recombination
• Number of alleles
• Crossing over
• Independent assortment

A change in allele frequencies is more likely to produce:

• Macroevolution
• Microevolution
• Mutation
• Inbreeding

A carrier of the sickle-cell trait has a(n):

• Homozgyous genotype
• Heterozygous genotype
• Homozygous phenotype
• Heterozygous phenotype

Gene flow promotes evolution through:

• Selective breeding
• Mutations
• Migration
• Inbreeding

Small populations have many problems maintaining stable numbers, partly because of:

• Inbreeding depression
• Limited resources
• Artificial selection
• founder effect

Earth's atmosphere probably originated:

• Before the planet solidified
• From volcanic gases
• From photosynthesis
• From space air

Which gas may have provided the carbon for the first organic compounds? 

• oxygen
• ammonia
• methane
• nitrogen 

The major difference between prokaryotes and eukaryotes is in:

• their cell membranes
• how they obtain energy
• their cell walls
• their internal enclosure of organelles