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An allele that has the same effect on the phenotype whether it is present in the homozygous or heterozygous state. Always displayed over recessive traits.
A test to determine the genotype of an organism with unknown ancestry that displays a certain trait. In the test, the tested organism is bred with a homozygous recessive organism.
Incorrect/unequal division of chromosomes into gametes
Chromosomes that have the same genes as each other, in the same sequence but do not necessarily have the same allele of those genes
An organism that has one copy of a recessive allele that causes a genetic disease in individuals that are homozygous for this allele. A person who possesses (but does not display) a genetic disease that can be passed down to his/her/zir offspring.
An allele that only has an effect on the phenotype when present in the homozygous state. Able to be covered up by a dominant trait.
The physical location of a gene on an organism's chromosomes.
When the gene controlling the characteristic is located on the sex chromosome and therefore associated with gender
A condition in which both alleles of a gene pair in a heterozygote are fully expressed, with neither one being dominant or recessive to the other
A small, localized change in the structure of a DNA strand, often involving a single base pair being changed.
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Locus
The physical location of a gene on an organism's chromosomes.
Recessive
An allele that only has an effect on the phenotype when present in the homozygous state. Able to be covered up by a dominant trait.
sex linkage
When the gene controlling the characteristic is located on the sex chromosome and therefore associated with gender
genetic mutation
A small, localized change in the structure of a DNA strand, often involving a single base pair being changed.
test cross
A test to determine the genotype of an organism with unknown ancestry that displays a certain trait. In the test, the tested organism is bred with a homozygous recessive organism.
Dominant
An allele that has the same effect on the phenotype whether it is present in the homozygous or heterozygous state. Always displayed over recessive traits.
Carrier
An organism that has one copy of a recessive allele that causes a genetic disease in individuals that are homozygous for this allele. A person who possesses (but does not display) a genetic disease that can be passed down to his/her/zir offspring.
Codominance
noun
A condition in which both alleles of a gene pair in a heterozygote are fully expressed, with neither one being dominant or recessive to the other
homologous chromosomes
Chromosomes that have the same genes as each other, in the same sequence but do not necessarily have the same allele of those genes
