a student studying the following pedigree state that person #9 is homozygous for a dominant trait. explain how she was able to determine this.
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Dominant traits are those that are expressed or seen when a heterozygous genotype is present. Heterozygous just means having two different alleles for a gene. One is usually dominant while one is recessive. Remember, recessive alleles are masked by dominant alleles.
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In general, generation is not skipped in case of a dominant trait; Thus, at least one of the parent must have possessed the trait.
The dominant trait of interest is represented by complete shaded shapes in the pedigree chart.
A homozygous dominant child has two allele that are dominant for the trait of interest; Both the parents must be homozygous dominant.
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