Sex linked monohybrid cross

With two alleles there are three possible combinations of alleles or genotypes and two possible appearances or phenotypes: The cross below shows how all four blood groups can arise from a cross between a group A and a group B parent.



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This value is always one less than the number of classes of results.



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Another example of codominance is sickle cell haemoglobin in humans.

030 - Advanced Genetic

X-Linked Inheritance

There are no mixed colours e. Sometimes the gene actually codes for a protein apparently unrelated to the phenotype. There is a blending with the heterozygous offspring.

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  1. It is important to note that a fifth factor affecting gene frequencies is population size. The genes present on the X and Y-chromosomes are called sex-linked genes.