BIOL 133 WEEK 8 CHAPTER 12 – QUESTION AND ANSWERS

BIOL 133 Week 8 Chapter 12 Study Questions What statement describes X-linked traits? Select all that apply. Sickle cell anemia is a recessive trait. A cross between two heterozygotes would produce what phenotypic ratio? Marfan syndrome is a dominant trait. A cross between a homozygous dominant and a heterozygote would produce what phenotypic ratio? If a cross for widow’s peak was conducted between a homozygous dominant and a heterozygote, it is expected that all organisms of the offspring will have widow’s peak. Even though all have the widow’s peak, they can _________. A and Z are independent events. The probability that A occurs is ¼. The probability that Z occurs is ¼. What is the probability that both will occur? If genes are completely linked, all the offspring will be _________. Low pitched male voices (RR) and a high pitched male voice (rr). Heterozygotes have a baritone voice. This is an example of _________. The allele for widows peak (H) is dominant for the allele for no widows peak (h). At a different gene locus, the allele for hitchhikers thumb (D) is dominant to the allele for the non-hitchhikers thumb (d). A man is heterozygote for the traits and marries a woman who has no widows peak and is heterozygote for hitchhikers thumb. What is the man’s genotype? Determine what statements describe Huntington’s disease? Select all that apply. In a monohybrid cross from heterozygous parents, of the offspring would be what genotypes? Select all that apply.