The genes associated with color blindness and hemophilia are located on the X chromosome. If the recombination
frequency between these genes is 25%, what is the genetic map distance between them? Explain how you arrived at your
answer, and why calculating recombination frequencies are an important step in creating genetic maps. What will be an ideal response?
ANSWER: A genetic map is made in two steps: (1) Finding linkage between two genes establishes that
they are on the same chromosome, and (2) measuring how frequently crossing over takes
place between them establishes the distance between them. The units of distance are
expressed as a percentage of crossing over, where 1 map unit is equal to a 1% crossover
frequency (one map unit is also known as a centimorgan, or cM). Therefore, a 25%
recombination frequency is equal to 25 map units or cM.
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a. 900 b. 800 c. 350 d. 700 e. 70
The distinctive fur color of a Siamese cat is an example of:
What will be an ideal response?
The above figure represents
a. membrane attack complex; pores in bacterial cell b. macrophage attack complex; fluids released from pores c. pores for mucus secretion ciliated lung tissue d. macrophages; muscle tissue e. none of these
Most of the dry mass of a plant is the result of uptake of _____
A) water and minerals through root hairs B) water and minerals through mycorrhizae C) carbon dioxide through stoma D) carbon dioxide and oxygen through stomata in leaves