Heterozygous: This means the individual has two different alleles for a specific gene. For example, one allele could be for brown eyes (B) and the other for blue eyes (b). The genotype would be written as Bb.
Dominant: This means that one allele (the dominant one) masks the expression of the other allele (the recessive one). In the example above, if brown eyes are dominant, an individual with the Bb genotype will have brown eyes, even though they carry the allele for blue eyes.
Heterozygous Dominant: This is essentially a more specific way of saying "heterozygous" in the context of dominant inheritance. It emphasizes that while the individual has two different alleles, the dominant allele is the one being expressed.
Example:
* Gene: Eye color
* Alleles: Brown (B) - dominant, Blue (b) - recessive
* Heterozygous genotype: Bb
* Phenotype (observable trait): Brown eyes
Key Points:
* In a heterozygous dominant situation, only the dominant allele is expressed in the individual's phenotype.
* The recessive allele is still present in the genotype but is not visible.
* This individual can still pass on the recessive allele to their offspring.
Let me know if you'd like more examples or want to explore other genetic concepts!
