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
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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.
Xylem tissue may contain each of these cell types, except which?
A. vessel members B. tracheids C. sieve cells D. fibers E. rays
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
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