Store-bought hybrid tomatoes are very popular with consumers. Suppose you buy a tomato from the grocery store, collect seeds from it, and plant the seeds
If the seeds do not germinate, the seedlings fail to thrive, or the plants die quickly after sprouting, what reproductive isolating mechanism might be responsible?
hybrid inviability
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A hair perforation test is performed using Trichophyton mentagrophytes and T. rubrum. The expected results are:
a. positive for both organisms. b. positive for T. rubrum and negative for T. mentagrophytes. c. positive for T. mentagrophytes and nega-tive for T. rubrum. d. negative for both organisms.
Secretive and hidden from taxation, as much as 60% of the world's money lies in offshore financial centers distributed throughout the world's
A) smaller countries and islands. B) rogue states. C) core. D) periphery. E) export processing zones.
Which phase comes immediately after gastrulation?
a. fertilization b. organ formation c. cleavage d. gamete formation e. tissue specialization
To integrate an F plasmid's genes into a host chromosome, there must be DNA recombination at homologous regions on the two circular strands. What is the minimum number of such crossover events needed for integration?
A) 1 B) 2 C) 3 D) 4 E) 8