Our readers dig into what makes someone – or thing – a redhead, and speculate as to what might make red fur useful ...

If individuals in the group tend to marry within it, there's a greater likelihood that the recessive genes of the founders will come together in the cells that produce offspring. Thus diseases of ...

In its simplest form, a test cross is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype (and phenotype).

Some missense mutations are known to cause disease. But what about the thousands of other missense mutations that have ...

One allele can be dominant and mask the effect of a second recessive allele in a heterozygous organism that carries two different alleles at a specific locus. Recessive alleles only express their ...

Recessive traits may skip generations and will affect both genders equally. An example of an autosomal recessive condition is cystic fibrosis. Cystic fibrosis close cystic fibrosisA disorder that ...

Similar genes occupy the same position on both chromosomes in the pair. Alleles can be dominant or recessive. Dominant alleles will be expressed even if a recessive allele is present. Recessive ...