Crossing an unknown dominant phenotype with a homozygous recessive to reveal its genotype.
The unknown dominant individual is crossed with a homozygous recessive. All dominant offspring suggest a homozygote, while a 1:1 ratio shows a heterozygote. It is used in breeding animals and plants.
Crossing an unknown dominant phenotype with a homozygous recessive to reveal its genotype.
Test Cross is one of the 54 topics in Genetics. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Monohybrid Cross, Incomplete Dominance, Mendel's Pea Experiments.
A black dog (B_) is test crossed to a chocolate (bb) one to find if it carries the recessive allele.
Work through the Beginner topics in Genetics first, such as Heredity, Gene, Allele, then return to Test Cross. Intermediate topics assume the Beginner vocabulary.
The closest topics to Test Cross are Monohybrid Cross, Incomplete Dominance, Mendel's Pea Experiments, Dominant and Recessive. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Test Cross. To practise the whole of Genetics, use the Genetics quiz.
Test Cross: Crossing an unknown dominant phenotype with a homozygous recessive to reveal its genotype. Monohybrid Cross: A cross following one gene with two alleles, giving a 3:1 phenotype ratio in the F2 generation. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Monohybrid Cross and explain the difference aloud. Finally, take the Genetics quiz and come back to this page for any question you miss.
A cross following one gene with two alleles, giving a 3:1 phenotype ratio in the F2 generation.
🧬 GeneticsThe heterozygote shows an intermediate phenotype, such as pink flowers from red and white parents.
🧬 GeneticsGregor Mendel crossed pea plants to discover the basic laws of inheritance in the 1860s.
🧬 GeneticsA dominant allele shows its effect when present in one copy; a recessive allele only shows when two copies are present.
🧬 Genetics