Introduction to Biology I
The following questions for you to answer are to prepare you for the
types of questions encountered on exams. Please upload the answers to
your instructor by the appropriate due date.
1. Explain Mendel’s Law of Segregation.
2. Make a Punnett square of the following cross and answer the questions
below. A heterozygous orange flowered plant is crossed with a
homozygous white flowered plant. Orange flowers are dominant.
Draw the Punnett square and submit it with your work.
What percentage of the offspring will be orange?
What percentage of the offspring will be white?
What is the genotype of the orange plants?
What is the genotype of the white plants?
What is the phenotypic ratio of this cross?
What is the genotypic ratio for this cross?
3. How does the dihybrid cross support the Law of Independent Assortment?
4. What is hemophilia? How is it inherited? Make a pedigree to illustrate its
pattern of inheritance. Include a key that explains your symbols.
5. Why is recombinant DNA technology so valuable to society? Provide two
specific examples to illustrate your points.
6. What is the only way to produce new alleles? Do mutations always result in
a change in the final protein product? Explain.
7. Imagine two populations that are not currently isolated from each other, but
the potential exists for that isolation to occur. Explain how mutations and
gene flow can work in opposition to each other to influence the DNA of
these two populations.
8. Given the following DNA sequence (3′ TACCAGGTAATC 5′) answer the
a. What is the complimentary DNA sequence?
b. What is the mRNA sequence generated during transcription?
c. The introns are bolded. What is the sequence of the mature
d. What is the amino acid sequence?
9. Explain the difference between microevolution and macroevolution.
10. MRSA, a type of Staph infection, is caused by a strain of bacteria that is
resistant to many types of antibiotics. Knowing what you know about
adaption and natural selection, describe how it would have been possible
for a bacterium that previously could be easily treated with antibiotics to
develop such a severe resistance to their effects.
If you fax any portion of this assignment, please put your name and your
instructor’s name on each page. Thanks.