How do you know if a dominant trait is homozygous or heterozygous?

How do you know if a dominant trait is homozygous or heterozygous?

To identify whether an organism exhibiting a dominant trait is homozygous or heterozygous for a specific allele, a scientist can perform a test cross. The organism in question is crossed with an organism that is homozygous for the recessive trait, and the offspring of the test cross are examined.

What is the difference between someone who is homozygous for a trait and someone who is heterozygous for a trait?

Homozygous and Heterozygous Basics The difference between these traits is: Homozygous traits have two copies of the same allele. Heterozygous traits have one dominant allele and one recessive allele.

How do you know if you are heterozygous?

If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed.

What is the genotype of a heterozygous individual?

A heterozygous individual is someone who has two different alleles at a locus. For instance, using the sickle cell example, a heterozygous individual might have a genotype of AS. The genotype for a homozygous individual might be AA or SS.

What is the genotype of an individual?

A genotype is an individual’s collection of genes. The term also can refer to the two alleles inherited for a particular gene. The expression of the genotype contributes to the individual’s observable traits, called the phenotype.

What does a heterozygous genotype look like?

The genotype might look like BB for two dominant alleles or bb for recessive alleles. The other possible combination is heterozygous, which means the genotype contains one of each allele, such as Bb. Just try to remember that hetero- means different, and homo- means the same.

Which is a codominant trait?

A trait resulting from an allele that is independently and equally expressed along with the other. Supplement. An example of codominant trait is blood type, i.e. a person of blood type AB has one allele for blood type A and another for blood type B. Word origin: co– from Latin cum (with) + dominant.