Chromosomal Makeup of a Cell

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Biology One - Science Majors Flashcards on Chromosomal Makeup of a Cell, created by lyndmrk on 09/11/2014.
lyndmrk
Flashcards by lyndmrk, updated more than 1 year ago
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Created by lyndmrk about 10 years ago
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Question Answer
Sex Chromosome Chromosome associated with an individual's sex
Autosome A non-sex chromosome
Sister Chromatids The two identical chromatid copies in a replicated chromosome
Replicated Chromosome A chromosome that has been copied; consists of two identical chromatids, each containing one double helical DNA molecule
Unreplicated Chromosome A chromosome that consists of one double helical molecule of DNA packaged with proteins
Homologous Chromosomes (homologs) In a diploid organism, chromosomes that are similar in size, shape, and gene content
Non-sister chromatids Chromatids belonging to homologous chromosomes (each parent cell)
Bivalent (or tetrad) Homologous replicated chromosomes that are joined together during the prophase I and metaphase I of meiosis
Haploid number The number of different types of chromosomes in a cell; symbolized n ex: Humans have 23 different types of chromosomes (n = 23)
Diploid Number The number of chromosomes present in a diploid cell; symbolized 2n ex: In all human cells except gametes are diploid and contain 46 chromosomes (2n = 46)
Ploidy The number of each type of chromosome present
Haploid Having one of each type of chromosome (n) ex: Bacteria and archaea are haploid, as are many algae; plant and animal gametes are haploid
Diploid Having two of each type of chromosome (2n) ex: Most familiar plants and animals are diploid
Polyploid Having more than two of each type of chromosome; cells may be triploid (3n), tetraploid (4n), hexaploid (6n) and so on
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