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17 Cards in this Set

  • Front
  • Back
One of two or more molecular forms of a gene that arise by mutation and specify slightly different versions of the same trait.
Unit of information for a heritable trait in DNA, passed from parents to offspring
Individual having a nonidentical pair of alleles for a trait being studied.
Having a pair of dominant alleles at a gene locus
Having a pair of recessive alleles at a gene locus.
having two identical alleles at a locus
For a specified trait, having two different alleles at a locus.
particular genes an individual carries (AA, Aa, aa)
an individual’s observable traits (red, pink, white)
Intercross between two individuals, each heterozygous for one gene (e.g., Aa).
Dihybrid cross
Intercross between two individuals, each heterozygous for two genes (e.g., AaBb).
Punnett square
Construction of a simple diagram to predict the probable outcomes of a genetic cross.
Test cross
Experimental cross to determine whether an individual of unknown genotype that shows dominance for a trait is either homozygous dominant or heterozygous
Independent assortment
In meiosis, each homologous chromosome and its partner are assorted into different gametes independently of other pairs.
Diploid cells have pairs of alleles
The two alleles are separated during meiosis
They end up in different gametes
“For a given trait, alleles separate”
Continuous variation
A more or less continuous range of small differences in a given trait among individuals
The greater the number of genes and environmental factors that affect a trait, the more continuous the variation in versions of that trait
G x E interactions
Environmental conditions affect the expression of genes