Medicine must respond with new drugs and vaccinations to the slow evolution of disease-causing
organisms such as bacteria and viruses.
__________________ Indicate whether the statement is true or false.
F, rapid
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Diploid organisms, such as humans and other mammals, have two copies of their genetic material in the form of homologous chromosomes. One copy of each homologous chromosome is passed to the organism from each of its parents during the process of fertilization. For many genetic traits, a diploid organism is said to be either homozygous or heterozygous at a particular locus, depending on whether its parents passed down two of the same or two different alleles for that specific sequence. Which of the following describes a homozygous locus?
Select all that apply. 1. The presence of two or more alleles fro a particular trait in the gene pool 2. The alleles at a particular position on homologous chromosomes of an individual with two true-breeding parent for different alleles 3. the alleles at a particular position on homologous chromosomes of an individual who expresses a recessive trait 4. two of the same alleles are found in a particular position on homologous chromosomes 5. two alleles that are positioned on the same chromosome
A ______________ group does not contain the most recent common ancestor.
Fill in the blank(s) with the appropriate word(s).
Where is the majority of DNA located in a human cell?
a. nucleus b. mitochondrion c. chloroplast d. ribosome
The unexpressed regions of split genes are called ________.
A. codons B. introns C. exons D. endons