While looking under a microscope, you see two neighboring daughter cells. One of the cells contains three chromosomes, and the other contains five. The parent cell normally contains four chromosomes. What could be the reason for the different number of
chromosomes in the cells?
A) Replication of DNA did not occur properly.
B) The nuclear envelope did not dissolve, so mitosis could not occur at all.
C) The division of sister chromatids of one chromosome did not occur properly during mitosis.
D) The division of homologous chromosomes during meiosis II did not occur properly.
Answer: C
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What is a karyotype?
A. A complete sequence of our DNA B. A picture of all the chromosomes in one person's cell C. A list of all the genes on our chromosomes D. A list of all the mutations in our chromosomes
The determination of the taxon to which an organism belongs is called ________.
A. classification B. systematics C. taxonomy D. identification
Dietary treatment of galactosemia ____
a. need not begin until one or two months after birth b. consists of very low protein intake c. can usually be discontinued by the age of twelve d. completely eliminates symptoms of the disease e. should be started within a few days after birth
You are a substitute teacher in a high school biology lab class on the day the students are dissecting fetal pigs. One student finds that his pig's lungs, liver, pancreas, and digestive organs are either missing or small and malformed. The student
scratches his head with his clean hand and says, "What went on here?" Although there may be more than one reason, what might you propose as an explanation based on embryonic development? What will be an ideal response?