Examlex
Solve the problem.
-How many different 4-letter radio-station call letters can be made if the first letter must be K or W, repeats are allowed, but the call letters cannot end in an O?
Drosophila Melanogaster
A species of small fruit fly that is extensively used as a model organism in genetic research.
Hybridization Studies
Research focused on crossing different species or genetic lines to study inheritance patterns, gene function, or the development of new traits.
Reproductive Barriers
Features that impede members of different species from producing offspring, or ensure that any offspring are sterile, thus playing a key role in speciation.
Escherichia Coli
A common bacterium found in the intestines of animals and humans; some strains can cause food poisoning or other illnesses.
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