two parents with normal phenotypes have a daughter who genetically inherited a disorder. Explain how this is possible.

Answer: This is possible only if the two parents ar e heterozygous for the trait and the genetic disorder is inherited in a recessive fashion.

Explanation: Phenotype is the outward appearance of an organism. Genotype is the genetic makeup of an individual, a genotype can not be seen but it is manifested in an observable trait known as phenotype. Every trait is controlled by a pair of gene inherited one from each parent. When the two parents are heterozygous for the trait (having one dominant allele and one recessive allele for the trait), a child can inherit two recessive alleles one from each parent.

For example, when two parents are heterozygous for sickle cell disease AS, a cross between them will produce an offspring with sickle cell disease. As x As = AA, As, As, and ss. (A is dominant and s is recessive).

Phenotype is physical appearance of the individual while genotype is the genetic makeup of the individual.

Explanation:

Two parents having normal phenotype but effected individual is due to the parents may be Carrier for the particular deseis and the gene responsible for the desies may be in recessive form and the parents are not effected. The gene is not present in dominant form and can not show its effect but the parents are not effected and the daughter may be affected by certain desiese.