Chpt 22 and 23 Test Flashcards
Which statement about variation is true?
All new alleles are the result of nucleotide variability
D
Which statement is true concerning genetic variation?
It must be present in a population before natural selection can act upon the population
C
Which of the following is not a plausible hypothesis to explain catapiller appearance?
Difference in air pressure
Cystic fibrosis is a genetic disorder…what are the expected frequencies?
F(A1)=.97
f(A2)=.03
For a biologist studying a large flatform in a lab which Hardy Weinberg condition is the hardest to meet?
No mutation
In a Hardy Weinberg population with two alleles A and a,
a) .9
Refer to the paragraph on Dark eyed junco birds…
Founder effect
An earthquake decimates a ground squirrel population
Genetic bottleneck
Which of the following is the most predictable outcome of increased gene flow?
Decreased genetic differences between the two populations
You are maintaining a small number of fruit flies in a lab
Cross your flies with flies from another lab
Currently the only predators of the Galapagos marine iguanas are hawks. Genetic factors expected to ______, iguanas would be under ______ selections
Decrease, directional
Adult males genetically have deeper voices.
Sexual dimorphism
Most Swiss startling produce 5 eggs in each clutch. Those producing fewer or more tend to have reduced fitness.
Stabilizing selection
When imbalances occur in the sex ratio of sexual species, more care goes to the minority species
Frequency dependent selection
A proficient engineer can easily design sketches that are more effective
Natural selection is generally limited to modifying structures that were present in previous generations (E)
Prior to the work of Lyell and Darwin, the prevailing belief was that Earth is,
A few thousand years old and the population is unchanging
If x indicates the location of fossils of two closely related species, then fossils of their most common ancestor are most likely to occur in which stratum?
C
Island forms of organisms are found to be different, but similar to mainland forms of organisms
Island forms are descended from mainland forms (A)
Starting from the wild mustard, breeders have created strains of brussels, sprouts, and kale
This shows that there is enough heritable variation to permit these different varieties (A)
Which of these conditions are always true of populations evolving due to natural selection
C) Conditions 1 and 2
Triazine herbicide and farmer…
D) Traizine resistant weeds were more likely to survive and reproduce
Claytonia virginica
A) The percentage of white flowers should increase over time
What is the correct sequence of following events under the influence of natural selection?
A) 2-4-1-3
A biologist studied a population of squirrels for 15 years…
D) The amount of available food may have increased and/or the predator population could have decreased
