1.) Human height occurs in a continuous range because it is affected

1.) Human height occurs in a continuous range because it is affected by the interaction of several genes, making it a: a.) autosomal traits b.) sex-linked trait c.) polygenic trait or d.) codominant trait 2.) for an XX female to express a recessive sex-linked trait, she must have: a.) a Y chromosome, b.) an inactive allele c.) two recessive alleles d.) two dominant alleles Solution (1) c.) polygenic trait Polygenic traits are controlled by more than one gene. Human height, eye and hair color are examples (2) c.) two recessive alleles In an X linked recessive trait, two copies of a recessive allele on the X chromosome are required for an individual with two X chromosomes (a female) to be affected with an X-linked recessive trait.