Crossing over is one of the most important events in
meiosis because
a. it produces new combinations of alleles on
chromosomes.
b. homologous chromosomes must be separated
into different daughter cells.
c. the number of chromosomes allotted to each
daughter cell must be halved.
d. homologous chromatids must be separated into
different daughter cells.
e. all of these reasons are true.
Answer: a
You might also like to view...
"Special pair" is the name given to the ________ in the photochemical complex of the purple bacteria
A) two bacteriochlorophyll a molecules B) two bacteriochlorophyll b molecules C) two quinones D) two reaction centers
Phenotypes can be positive, negative, or neutral in a population. A sharp contrast between balanced polymorphism and the three types of natural selection is that in balanced polymorphism
A. not only are multiple alleles persistent in a population, but all may be preserved. B. multiple alleles of a gene persist indefinitely in a population. C. many traits persist by only a single allele. D. polygenic traits in a population may mask the observation of extreme or intermediate phenotypes. E. all phenotypes may be preserved in a population.
In December of 1998, Nkem Chukwu of Houston,
Texas, gave birth to a. pentuplets. b. sextuplets. c. octuplets. d. the first human clone. e. none of these.
Tuberculoid Hansen's disease is caused by the pathogen
A) Listeria monocytogenes. B) Mycobacterium leprae. C) Mycobacterium tuberculosis. D) either Mycobacterium leprae or Mycobacterium tuberculosis.