Mendelian and Non Mendelian traits

Front

What is a dominant trait?

Back

A dominant trait is a genetic trait that is expressed in the phenotype even when only one copy of the allele is present. For example, in the case of freckles (F), the presence of one dominant allele (F) will result in freckles.

Front

What is a recessive trait?

Back

A recessive trait is a genetic trait that is only expressed in the phenotype when two copies of the allele are present. For example, no freckles (f) is a recessive trait and is expressed only when the genotype is ff.

Front

What is the genotype of a heterozygous individual?

Back

The genotype of a heterozygous individual consists of two different alleles for a particular gene, such as Ff.

Front

What is the genotype of a homozygous dominant individual?

Back

The genotype of a homozygous dominant individual consists of two identical dominant alleles for a particular gene, such as FF.

Front

What is the genotype of a homozygous recessive individual?

Back

The genotype of a homozygous recessive individual consists of two identical recessive alleles for a particular gene, such as ff.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences. For example, blue eyes are a phenotype.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles inherited from the parents. For example, a blue-eyed child has the genotype bb.

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygous individual contribute to the phenotype. For example, in blood types, A and B are codominant.

Front

What is the probability of having a child with a recessive trait if one parent is heterozygous and the other is recessive?

Back

The probability is 50%. The heterozygous parent (Ff) can pass on either the dominant (F) or recessive (f) allele, while the recessive parent (ff) can only pass on the recessive allele.

Front

What are the blood type genotypes for A, B, AB, and O blood types?

Back

A: AA or AO, B: BB or BO, AB: AB, O: OO.