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Huntington’s chorea is a disease that is caused by a dominant allele. the % chance of a child having this disease if both parents have the disease and are heterozygous is 50%
A gene region where there are two distinct alleles present. One normal allele and one mutated allele, or two distinct mutated alleles, can make up a heterozygous genotype (compound heterozygote).
You have a heterozygous genotype for that gene if the two versions differ from one another. For instance, having one gene for red hair and one allele for brown hair could indicate that you are heterozygous for hair color. Which qualities are expressed depends on how the two alleles are related.
When two identical copies of a gene are present, you are said to be homozygous for that gene. It contrasts with a heterozygous genotype, in which the alleles are distinct. Everyone who possesses a recessive trait, such as red hair or blue eyes, is homozygous for that gene
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