Homozygous means two identical alleles for a gene; heterozygous means two different alleles.
Homozygous individuals have two identical alleles (TT or tt) and breed true for that trait. Heterozygotes (Tt) carry two different alleles and can pass either on. Carriers of a recessive disease are heterozygous and usually healthy.
Heterozygote advantage maintains some alleles; carriers of one sickle cell allele resist malaria.
Homozygous means two identical alleles for a gene; heterozygous means two different alleles.
Homozygous and Heterozygous is one of the 54 topics in Genetics. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Dominant and Recessive, Hardy-Weinberg Principle, Inherited Disorders.
Two carrier parents of cystic fibrosis have a 25 percent chance of an affected child each pregnancy.
Homozygous and Heterozygous is a Beginner topic, so no earlier topic is required. Other Beginner topics in Genetics that pair well with it include Heredity, Gene, Allele.
The closest topics to Homozygous and Heterozygous are Dominant and Recessive, Hardy-Weinberg Principle, Inherited Disorders, Codominance. 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 Homozygous and Heterozygous. To practise the whole of Genetics, use the Genetics quiz.
Homozygous and Heterozygous: Homozygous means two identical alleles for a gene; heterozygous means two different alleles. Dominant and Recessive: A dominant allele shows its effect when present in one copy; a recessive allele only shows when two copies are present. 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 Dominant and Recessive and explain the difference aloud. Finally, take the Genetics quiz and come back to this page for any question you miss.
A dominant allele shows its effect when present in one copy; a recessive allele only shows when two copies are present.
🧬 GeneticsPredicts that allele and genotype frequencies stay constant in an idealised population, following p squared plus 2pq plus q squared.
🧬 GeneticsConditions caused by faulty genes passed through families, such as cystic fibrosis and sickle cell disease.
🧬 GeneticsBoth alleles are fully expressed in the heterozygote, as in the AB blood type.
🧬 Genetics