What are autosomal traits controlled by?
Humans contain 23 pairs of chromosomes, 22 pairs of which are autosomes while 1 pair are the sex chromosomes. Interestingly, humans are the only great apes with 23 pairs of chromosomes while the other great ape species have 24 pairs of chromosomes. Researchers discovered that two of the ape chromosomes were fused in humans, forming autosomal chromosomes 2.
Answer and Explanation:
Autosomal traits are controlled by genes located on chromosome 1 through chromosome 22, the autosomes. These genes can be dominant, recessive or codominant. Dominant genes will express a trait in all circumstances and only require one copy of the gene for the trait to manifest. Recessive genes cannot express in the presence of another, contradictory allele. Therefore, they require the inheritance of two copies of the recessive gene to manifest. Codominant genes are alleles that both express themselves when present with neither overriding the other.
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from Biology 102: Basic GeneticsChapter 6 / Lesson 3