Which of the following is the BEST definition of a homologous chromosome?
a) a chromosome that has undergone crossing over
b) one of two identical chromosomes held together by a centromere
c) the central area that joins two chromatids
d) the type of chromosome found in prokaryotes
e) one of two chromosomes of the same length and type inherited from a father or mother
Ans: e) one of two chromosomes of the same length and type inherited from a father or mother
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A very rudimentary “brain” found in flatworms consists of a collection of neurons that
integrate information called __________.
a. ganglia b. a spinal cord c. a nerve net d. interneurons
What is a main function of the structure in the accompanying figure labeled "A"?
a. It controls cell shape. b. It separates DNA during cell division.
c. It helps nerve cells lengthen. d. It is found in hair. e. It helps regulate DNA replication.
Briefly describe the three phases included in most evolutionary models for the preservation of duplicate genes, and the evolutionary processes involved
What will be an ideal response?
In an operon, the switch that controls mRNA synthesis is the promotor, which is a sequence of bases
upstream from the first structural gene. __________________ Indicate whether the statement is true or false.