If the test cross results in any recessive offspring, then the parent organism is heterozygous for the allele in question. If the test cross results in only phenotypically dominant offspring, then the parent organism is homozygous dominant for the allele in question.
What cross will result in half dominant and half recessive phenotype offspring?
Tutorial. In the test cross invented by Mendel, the plant with the dominant phenotype is crossed with a plant that is homozygous for the recessive trait. If the unknown is homozygous, all offspring will have the dominant phenotype. If the unknown is heterozygous, half of the offspring will have the recessive phenotype.
What is the only way to see the recessive phenotype in the offspring?
Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait. One example of a recessive inherited trait is a smooth chin, as opposed to a dominant cleft chin.
Can recessive genes be passed to offspring?
Recessive inheritance means both genes in a pair must be abnormal to cause disease. People with only one defective gene in the pair are called carriers. These people are most often not affected with the condition. However, they can pass the abnormal gene to their children.