What does the term homozygous mean?
What does the term homozygous mean?
Having two identical alleles for a particular gene
Having no alleles for a particular gene
Having a mutation in a particular gene
Having two different alleles for a particular gene
The Correct Answer and Explanation is :
The correct answer is:
Having two identical alleles for a particular gene.
Explanation:
The term homozygous refers to a genetic condition where an individual has two identical alleles for a specific gene. Alleles are different forms of a gene that can exist at a specific location (locus) on a chromosome. For a particular gene, you inherit one allele from your mother and one from your father. When both of these alleles are the same, the individual is said to be homozygous for that gene.
For example, if the gene in question is for eye color, and both alleles inherited from the parents are for brown eyes (represented as “BB” or “bb”), the individual is homozygous for the eye color gene. If the individual has two identical alleles, either dominant or recessive, they are homozygous.
Homozygosity can occur for both dominant and recessive traits:
- Dominant homozygous (e.g., BB): The individual carries two dominant alleles for a gene. In this case, the dominant trait will be expressed.
- Recessive homozygous (e.g., bb): The individual carries two recessive alleles. In this case, the recessive trait will be expressed, but only if both alleles are recessive.
In contrast, if an individual has two different alleles for a gene, they are described as heterozygous (e.g., Bb). In a heterozygous situation, the dominant allele typically masks the effect of the recessive allele.
The concept of homozygosity is important in genetics, as it influences how traits are inherited and expressed in offspring. Individuals who are homozygous for a gene are more likely to pass on the same allele to their children, whereas those who are heterozygous have a mix of alleles that can lead to more genetic diversity in the next generation.