Genetic Terminology

Heterozygous
At a gene locus when its cells contain 2 different allele of a gene eg Bb
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Epistasis
Expression of one gene depends on the presence of one or more other gene
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Chiasmata
Point where maternal and paternal chromatids cross over
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Dominant
Allele that is expressed and seen even if only a single copy present eg B
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Homozygous
At a gene locus when its cell contains two of the same allele of a gene eg BB
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Centriole
Help to organize the assembly of spindle fibres during cell division
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Genotype
The genetic makeup of a cell, an organism, or a an individual
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Codominant
Both alleles expressed and seen eg AB
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Centromere
Pat of chromosome that links sister chromatids
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Recessive
Allele that is expressed and only seen when no dominant allele is present
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Spindle Fibre
lengths of microtubule that chromosomes during cell division attach to
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Crossing over
maternal and paternal alleles are swapped in prophase I
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Allele
Alternative form of a gene (one member of a pair) that is located at a specific position on a specific chromosome
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Homologous
The chromosome that pair up during meiosis
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Linkage
Genes that are found on the same chromosome
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Phenotype
Observable characteristics from the expression of an organism's genes as well as the influence of environmental factors
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Chromatid
Contains the replicated DNA of each individual chromosome, which are joined by a centromere
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Locus
Position of a gene along a chromosome
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Other cards in this set

Card 2

Front

Expression of one gene depends on the presence of one or more other gene

Back

Epistasis

Card 3

Front

Point where maternal and paternal chromatids cross over

Back

Preview of the back of card 3

Card 4

Front

Allele that is expressed and seen even if only a single copy present eg B

Back

Preview of the back of card 4

Card 5

Front

At a gene locus when its cell contains two of the same allele of a gene eg BB

Back

Preview of the back of card 5
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