Examlex
In a_____ procedure, a distinct stimulus is presented prior to an opportunity for a response to occur and be followed by a reinforcement, and the next response cannot occur until another stimulus is presented, and so on.
Karyotypes
The number and visual appearance of the chromosomes in the cell nuclei of an organism or species.
Prophase
The first stage of cell division in both mitosis and meiosis, characterized by the condensation of chromosomes and the breakdown of the nuclear envelope.
Chromatin
The complex of DNA and proteins, mainly histones, that forms chromosomes within the nucleus of eukaryotic cells.
Visible Chromosomes
Chromosomes that are condensed and made visible under a microscope during cell division.
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