Syntenic genes can assort independently when __________

A) they are very close together on a chromosome
B) they are located on different chromosomes
C) crossing over occurs rarely between the genes
D) they are far apart on a chromosome and crossing over occurs frequently between the genes
E) they are far apart on a chromosome and crossing over occurs very rarely between the genes


D

Biology & Microbiology

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Reproductive isolating mechanisms are divided into categories based on when they act. ____ isolating factors prevent fertilization from taking place; ____ isolating factors result in failure of the fertilized egg to develop into a fertile individual

Fill in the blank with the appropriate word.

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Xylem tissue may contain each of these cell types, except which?  

A.  vessel members B.  tracheids C.  sieve cells D.  fibers E.  rays

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Which structure of the heart is attacked by the immune system in a case of rheumatic fever?

a. aorta b. vena cava c. myocardium d. heart valves e. sinoatrial node

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A high concentration of chlorophyll embedded in the plasma membrane fold of a newly discovered species of bacteria suggests a

A. Chemolithoautotrophic metabolism B. Photoautotrophic metabolism C. Chemoheterotrophic metabolism D. Photoheterotrophic metabolism

Biology & Microbiology