AP BIOLOGY

Detailed explanation-1: -A recessive allele does not produce a trait at all when only one copy is present. This contrasts to a dominant trait, which requires that only one of the two alleles be present to express the trait.

Detailed explanation-2: -The Law of Dominance states: An organism receives two genes for each trait, one from each parent One of the genes may be stronger; the trait of the stronger gene shows up and is called the dominant gene. The trait of the weaker gene is “hidden” or does not show up and is called the recessive gene.

Detailed explanation-3: -Genes come in pairs (that is, are present in two copies in an organism). Genes come in different versions, now called alleles. When an organism has two different alleles of a gene, one (the dominant allele) will hide the presence of the other (the recessive allele) and determine appearance.

Detailed explanation-4: -The type of allele that is often hidden or overshadowed by dominant allele is known as a recessive allele. The trait expressed by the recessive allele only manifests if the individual is homozygous for that trait. Alleles are different forms of genes for a particular trait.

Detailed explanation-5: -If you are born to parents who both carry the same autosomal recessive gene, you have a 25% (1 in 4) chance of inheriting the abnormal gene from both parents and developing the disease. You have a 50% (1 in 2) chance of inheriting one abnormal gene.