Alleles can be either dominant or recessive. Dominant alleles are expressed when present in an individual, masking the expression of the recessive allele. Recessive alleles are only expressed when an individual has two copies of the recessive allele. The interaction between dominant and recessive alleles determines the phenotype of an organism. **

X-linked recessive inheritance refers to the inheritance of a recessive trait located on the X chromosome. This means that the trait is more commonly expressed in males, as they only have one X chromosome. In contrast, recessive inheritance refers to the inheritance of a trait that requires two copies of the gene to be expressed, one from each parent. This type of inheritance can affect both males and females equally. **

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Gonosomal recessive inheritance refers to a pattern of inheritance where a genetic trait or disorder is carried on one of the sex chromosomes (X or Y) and is only expressed when both copies of the gene are mutated. In this type of inheritance, the trait is typically passed from carrier mothers to their sons, as sons inherit their X chromosome from their mother. Daughters of carrier mothers have a 50% chance of being carriers themselves. Examples of gonosomal recessive disorders include hemophilia and color blindness. **

Autosomal dominant inheritance is a pattern of inheritance where a single copy of a mutated gene from one parent is enough to cause a genetic disorder or trait to be expressed. This means that if a person inherits one copy of the mutated gene, they will have the disorder, even if the other copy of the gene is normal. In contrast, autosomal recessive inheritance requires two copies of the mutated gene, one from each parent, to cause the disorder to be expressed. This means that individuals who inherit only one copy of the mutated gene are carriers of the disorder but do not show symptoms. **

A dominant allele is a genetic variant that is expressed when present in a single copy in an individual's genotype. It masks the expression of the corresponding recessive allele. On the other hand, a recessive allele is only expressed when an individual has two copies of it in their genotype. In a heterozygous individual (having one dominant and one recessive allele), the dominant allele will be expressed, while the recessive allele will be masked. This is the basis of Mendelian genetics and inheritance patterns. **

This inheritance is autosomal recessive because the trait or disorder is caused by a mutation in a gene located on one of the autosomes (non-sex chromosomes). In an autosomal recessive inheritance pattern, an individual must inherit two copies of the mutated gene, one from each parent, in order to express the trait or disorder. If an individual inherits only one copy of the mutated gene, they are considered a carrier and do not show symptoms of the disorder. This inheritance pattern often results in the trait or disorder skipping generations and appearing in siblings of affected individuals. **

Tongue rolling is considered to be a dominant genetic trait. This means that if a person inherits at least one copy of the dominant allele for tongue rolling, they will be able to roll their tongue. On the other hand, if a person inherits two copies of the recessive allele, they will not be able to roll their tongue. Therefore, the ability to roll the tongue is more likely to be expressed in individuals who have at least one dominant allele for this trait. **