Members of the ____ lineage, known as leeches, are mostly freshwater parasites, are dorsoventrally flattened, and do
not have septa.
a. Hirudinea
b. Polychaeta
c. Monogenoidea
d. Cestoda
e. Oligochaeta
ANSWER: a
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Assume that one allele is completely dominant over the other for the following questions.
a. Two individuals heterozygous for a single trait have children. What is the expected phenotypic ratio of the possible offspring? b. Two individuals heterozygous for two traits have children. What would be the expected phenotypic ratio of the possible offspring? c. Crossing two individuals heterozygous for two traits results in the same phenotypic ratio as for a single trait. Are the genes for these two traits on separate chromosomes or on the same chromosome? Explain your answer. (Remember that the gene for each trait is located at a locus, a physical region on the chromosome.) Yes, the traits would be on the same chromosome as the loci are linked.
Choose the correct sequence of events involving allopolyploidy that gave rise to modern tobacco.
A. hybridization, chromosome doubling, duplicate gene loss B. hybridization, duplicate gene loss, chromosome doubling C. chromosome doubling, hybridization, duplicate gene loss D. duplicate gene loss, hybridization, chromosome doubling
A mutation has occurred during DNA replication while the cell was preparing to divide. As a result of this, the codon ACU of mRNA has now become ACC. Interestingly, there is no change to the protein being made. Why not?
A. This is not a mutation that causes a big change, so there is no change to the protein being made. B. This is a silent mutation. C. The original amino acid isoleucine was changed to leucine, but they are the same variation of amino acid so no change to the protein. D. The mutation was fixed, and even though the codon is now ACC the correct amino acid is put into place for the normal protein.
As tissue fluid accumulates, the hydrostatic pressure of the ____________ increases, driving fluid into the lymphatic capillaries. Fluid entering the lymphatic capillaries is referred to as ____________ .
Fill in the blank(s) with the appropriate word(s).