Definition. A phenotype that occurs even when the causal allele occurs in a heterozygous individual.
What is a dominant phenotype?
Organisms that reproduce sexually carry genes from each parent. … The genes that are expressed are responsible for your traits, or phenotype. A dominant phenotype is a trait resulting from a dominant gene.
When is a phenotype dominant?
Dominance affects the phenotype derived from an organism’s genes, but it does not affect the way these genes are inherited. Complete dominance occurs when the heterozygote phenotype is indistinguishable from that of the homozygous parent.
How can you tell which phenotype is dominant?
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 phenotype example?
Examples of phenotypes include height, wing length, and hair color. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
How many different phenotypes are possible?
Even though only four different phenotypes are possible from this cross, nine different genotypes are possible, as shown in Figure 13.
Is heterozygous dominant or recessive?
Difference between homozygous and heterozygous
The term “heterozygous” also refers to a pair of alleles. Unlike homozygous, being heterozygous means you have two different alleles. You inherited a different version from each parent. In a heterozygous genotype, the dominant allele overrules the recessive one.