Alleles

Some articles on alleles, allele:

Compound Heterozygosity
... heterozygosity in medical genetics is the condition of having two heterogeneous recessive alleles at a particular locus that can cause genetic disease in a ... That is, an organism is a compound heterozygote if it has two recessive alleles for the same gene, but with those two alleles being different from each other (for example, both alleles might be mutated but ... disease arise in individuals who have two unrelated alleles, who technically are heterozygotes, but both the alleles are defective ...
Lethal Alleles
... Alleles that cause an organism to die only when present in homozygous condition are called lethal alleles ... However, it was discovered that a mutant allele could cause death ... If the mutation is caused by a dominant lethal allele, the heterozygote for the allele will show the lethal phenotype, the homozygote dominant is impossible ...
Mixed Twins
... Different alleles or gene variants code for differences in the melanin found within the skin ... Within some groups we find high frequencies of dark skin alleles, while others have high frequencies of light skin alleles, for example ... of such twins, who are typically both of mixed race, have a combination of alleles for light and dark skin in their genome ...
HLA A1-B8 Haplotype
... A multigene haplotype is set of inherited alleles covering several genes, or gene-alleles common multigene haplotypes are generally the result of ... However, there are many other gene-alleles within the haplotype ...
ABO (gene) - Common Alleles
... and evolutionary history There are six common alleles in individuals of European descent the ABO gene that produce one's blood type A A101 (A1) A201 (A2) B B101 (B1) O O01 (O1) O02 (O1v) O03 (O2) Many rare ...