Among heritable diseases, which genotype can be present in...

Among heritable diseases, which genotype can be present in an individual without causing a disease phenotype in that individual? A. heterozygous for a dominant disease; B. homozygous for a dominant disease; $\mathbf{C}$. heterozygous for recessive disease; D. homozygous for a recessive disease; E. all of the above.

Among heritable diseases, which genotype can be present in an individual without causing a disease phenotype in that individual?
A. heterozygous for a dominant disease; B. homozygous for a dominant disease; $\mathbf{C}$. heterozygous for recessive disease; D. homozygous for a recessive disease; E. all of the above.

Key Concepts

Heterozygous Carrier Status

Being heterozygous for a recessive mutation means an individual has one mutated allele and one normal allele. This individual typically does not display the disease phenotype but can still pass the mutated allele to offspring, making this status a key factor in understanding non-expressive genotypes for recessive diseases.

Recessive Inheritance

Recessive inheritance requires the presence of two copies of a mutated allele for the disease phenotype to be expressed. Individuals with only one copy, known as carriers, usually do not show any symptoms of the disease because the normal allele compensates for the mutated one.

Genotype vs Phenotype

This concept differentiates between the genetic makeup (genotype) of an individual and the observable characteristics or traits (phenotype). It explains that the presence of a mutation in the genotype does not always result in the expression of the associated disease phenotype, particularly in cases where the mutation is recessive.

Genetic Inheritance Patterns

This concept refers to the way genetic traits or diseases are transmitted from parents to offspring, including the rules and patterns that dictate the expression of these traits based on the combination of alleles inherited from each parent.

Dominant Inheritance

Dominant inheritance is when only one copy of a mutated allele is sufficient to cause the disease phenotype. If an individual carries a dominant disease allele, they will typically display the disease, as the mutant allele overpowers the normal one.

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