In a fish population in a shallow stream, the genotypic frequency of yellowish-brown fish and greenish-brown fish changed significantly after a flash flood randomly swept away individuals from that stream. This change in genotypic frequency is most likely attributable to
a) gene flow
b) disruptive selection
c) directional selection
d) genetic drift
e) natural selection
Answer: d) genetic drift
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Imagine you are a doctor and you are presented with a female patient who has been unable to get pregnant despite 2 years of trying with the same partner. Rank the following factors from most important (#1) to least important (#4) in your determination of the cause of her apparent infertility.
a. Her STD history b. Her hormone levels c. Her partner's age d. Her age
The swapping of corresponding segments between homologous chromosomes is ____________________. Fill in the blank(s) with the appropriate word(s)
The phenotype determines the genotype
Indicate whether the statement is true or false
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds are most visually sensitive to the color red. Hummingbird flowers are pollinated by hummingbirds. Which of the following features of these flowers would indicate they have coevolved with hummingbirds? (Check all that apply.)A) Long tubular flowersB) Flowers are colored violet and blueC) Blooming time of the flowers coincides with the arrival of the hummingbirdsD) Flowers produce a high volume of nectar and sugarE) Flowers are low to the ground
What will be an ideal response?