Which phrase best defines what is meant by gene linkage?
a. genes that affect two different traits and that lead to a 9:3:3:1 phenotype ratio in a dihybrid cross
b. genes that do not sort independently due to their being physically near each other on the same chromosome
c. different alleles of the same gene
d. genes whose effects combine to affect a single characteristic
Ans: b. genes that do not sort independently due to their being physically near each other on the same chromosome
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Given the following sequence of genes on a chromosome, determine what change in chromosome structure occurred. (the * indicates the centromere)
before A B C D * E F G H after A B C D * E F E F G H A. Terminal deficiency B. Interstitial deficiency C. Inversion D. Gene duplication
Cloned B cells which produce antibodies that are specific to a particular antigen are called _______ cells.
Fill in the blank(s) with the appropriate word(s).
Many male songbirds are brightly colored. However, the color of the birds is determined by a balance of
A. natural selection against bright colors by predation and sexual selection in favor of bright colors. B. mutations that reduce bright colors and sexual selection in favor of bright colors. C. gene flow that reduces bright colors and natural selection in favor of bright colors. D. mutations that reduce bright colors and gene flow in favor of bright colors. E. natural selection against bright colors by predation and mutations that introduce bright colors.
A unique species of snail has been discovered in the Negev Desert. At night, these snails use a toothlike rasping organ in their head to scrape up porous limestone; they then digest the algae that lived in the rock pores. This scraping organ is the
A. mantle. B. labial palp. C. crop. D. tentacle. E. radula.