In an environment in which members of a population compete with each other for resources, a change occurs that selects against members that exhibit a particular dominant trait (the trait exhibits complete dominance). Which graph best depicts the trends in genotypic frequencies that would be expected to occur over time?
A) graph A
B) graph B
C) graph C
D) graph D
Answer: B) graph B
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If a normal egg is fertilized by a sperm which
has an extra chromosome, what will be the chromosomal condition of the zygote?
a. three copies of the affected chromosome and two of all others b. three copies of all chromosomes c. four copies of the affected chromosome and two of all others d. one copy of the affected chromosome and two of all others e. two copies of all of the chromosomes
Organisms that reproduce repeatedly are said to be
A. semelparous. B. iteroparous. C. r-selected D. cohorts. E. K-selected
During replication, which enzyme unwinds the DNA double helix?
A. DNA polymerase I B. DNA helicase C. DNA primase D. DNA ligase E. DNA gyrase
Many bacteria and fungi have a difficult time surviving on our food if the food is very salty. The best explanation for this is...
What will be an ideal response?