dominant and recessive dominance table 3. alleles sequence of dna any of several forms of a gene...
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Dominant and Recessive Dominance
Table 3
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Alleles• sequence of DNA• any of several forms of a gene• determine the genotype (genetic
constitution of an organism or a group of organisms) of their host organism
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Dominant Alleles• expressed over the recessive allele• represented by capital letters• determines the phenotype (any observable
characteristic of an organism) of an organism
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Recessive Alleles• hidden by it's dominant partner but still
present in heterozygous individuals (an organism that has two copies of the same allele)
• only expressed when there are two recessive alleles
• represented by lower case letters
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Genes• a unit of heredity in a living organism• a region of DNA that controls a hereditary
characteristic• carries biological information in a form that
must be copied and transmitted from each cell to all its progeny
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Dominant Genes• causes a person to have a particular physical
characteristic• when written in a genotype is always written
before the recessive gene in a heterozygous pair (two different forms of a particular gene)
• a person only needs to inherit one copy of the gene for the trait to be expressed
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Recessive Genes• can only be expressed in homozygous (aa)
individuals (an organism that has two copies of the same allele)
• has its expression masked in the presence of a dominant gene
• a person needs to inherit two copies of the gene for the trait to be expressed
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Traits • a distinguishing characteristic or quality• come from our genes, which are unique to
each person
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Dominant Traits• will manifest when only one copy of the
gene is present• will be possessed as long as you inherit it
from either of your parents
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Recessive Traits• can be carried in a person's genes without
appearing in that person• will be possessed only if you inherit it from
both parents
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