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

Biology & Microbiology

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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

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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.

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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?

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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.

Biology & Microbiology