If alleles R and s are linked on one chromosome and r and S are linked on the homologous chromosome, what gametes will be produced? (Assume that no crossing-over occurs.)
a. RS, Rs, rS, rs
b. RS, rs
c. Rs, rS
d. R, S, r, s
c. Rs, rS
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When we say that an organism is haploid, we mean that _____.
A. its cells each have two sets of chromosomes B. its cells each have one chromosome C. its cells each have one set of chromosomes D. Its cells have one half of a chromosome
Who demonstrated the crossover of homologous chromosomes in experiments on corn plants?
a. Frans Janssen and Curt Stern b. Thomas Hunt Morgan and Alfred Sturtevant c. Harriet Creighton and Barbara McClintock d. Walter Sutton and Theodor Boveri
All of the following are located on the exterior
surface of a prokaryote EXCEPT a. flagellum b. pilus c. plasma membrane d. capsule e. none of these
Which of the following statements is false?
a. Crossing over tends to reduce the frequency that two linked genes are inherited together. b. Independent assortment of homologous chromosomes during meiosis increases variation. c. Crossing over leads to variation. d. An abnormal number or structure of chromosomes may influence the course of evolution. e. The closer together genes are found on a chromosome, the greater the chance that crossing over will occur between them.