What role do plasmodesmata play in plant cells?
-They prevent the plant cell from losing water in desert conditions.
-They allow the plant cell to withstand extreme temperatures.
-They serve as sites of protein production in the cell.
-They serve as communication portals between neighboring plant cells, allowing the passage of substances between the two cells.
They serve as communication portals between neighboring plant cells, allowing the passage of substances between the two cells.
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GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG. What effect does this mutation have on the population's mean fitness?
A. As the frequency of the GGC codon increases, the population's mean fitness level will remain the same.
B. As the frequency of the GGC codon increases, the population's mean fitness level will initially increase, but once GGC and GGG occur with equal frequency, the mean fitness will decrease.
C. As the frequency of the GGC codon increases, the population's mean fitness level will decrease.
D. As the frequency of the GGC codon increases, the population's mean fitness level will increase.
The biological species concept
1.defines a species as a group that can interbreed and produce fertile offspring. 2.applies to asexually reproducing organisms. 3.looks at visible traits. 4.emphasizes evolutionary relationships. 5.was used by Carolus Linneaus.
Evolution is the genetic change in a species over time.
Answer the following statement true (T) or false (F)
Two semelparous species of fish lay about 100 eggs when reproducing. One reaches reproductive age a year before the other. Assuming there is no competition for resources in the lake they inhabit (population density is low), which species has higher fitness?
A. The species that reproduces earlier has higher fitness, as their genes will spread faster B. The species that reproduces later has higher fitness as they also live longer C. Both have the same fitness as they lay the same number of eggs