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Transistor operation is being discussed. Technician A says that when the base of a PNP is connected to ground, the transistor is turned off. Technician B says that when the base of an NPN transistor has a positive voltage applied to it, the transistor is turned on. Who is correct?
Zygotes
The initial cell formed when two gamete cells (e.g., sperm and egg) are fused, representing the earliest stage of embryonic development in sexually reproducing organisms.
Homologous Chromosomes
Pairs of chromosomes in a diploid organism that are similar in shape, size, and genetic content, one inherited from each parent.
Prophase I
The first stage of meiosis I where homologous chromosomes pair up and exchange genetic material through recombination.
Chiasma
An X-shaped site in a tetrad usually marking the location where homologous (nonsister) chromatids previously crossed over.
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