A genetic carrier (or just carrier), is a person or other organism that has inherited a recessive allele for a genetic trait or mutation but does not display that trait or show symptoms of the disease. Carriers are, however, able to pass the allele onto their offspring, who may then express the gene if they inherit the recessive allele from both parents. The chance of two carriers having a child with the disease is 25%. This phenomenon is a direct result of the recessive nature of many genes.
Punnett square depicting a cross between two genetic carriers. The chance of two genetic carriers having a child with two copies of the recessive gene, thus being homozygous recessive, is 25%.
Examples:
- Cystic fibrosis
- Sickle cell anemia
#Genetics #gene #Allele #homozygous #punnettSquare #Autosomal #RecessiveAllele #geneticTrait #mutation #NikolaysGeneticsLessons #medical #education #medicine #doctor #AutosomalDominant #AutosomalRecessive #chromosomes #meiosis #paediatrics #cysticFibrosis #huntingtonsChorea #foamed #medstudent #biology #recessive #diseases #NCMG #UCDMedicine #inheritance #dominant #recurrence #deNovo #GeneticsFieldOfStudy #autosome #HeredityDiseaseCause #HunterGenetics
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