27. Recessive traits are very rare, because it is necessary to inherit two recessive alleles in order to T□ F■ show the trait phenotypically. 28. If a woman who has a genetic disease and is heterozygous for the disease allele marries a man T■ F□ who does not have the disease, there is a 50-50 chance their first child will have the disease. 29. In incomplete dominance, a heterozygous individual has a phenotype which is intermediate T■ F□ between the two homozygous phenotypes. Matching: 1. Below are results from some crosses, some of which would have surprised Mendel a bit. Match each with the term that best going on. describes what’s Two pure-breeding parents are crossed. All offspring have a a. complete dominance B phenotype that is different from either parent. b. incomplete dominance A child with blood type AB is born to a type A parent and a type c. codominance C B parent. d. overdominance A child with blood type O is born to a type A parent and a type e. multiple alleles E B parent. f. dihybrid cross g. happen In a cross between two parents with the same phenotype, ¾ of can’t A the offspring resemble the parents and ¼ do not. Fill in the blank: 1. If an two alleles for a given gene are different, we say that individual is heterozygous. If individual’s we’re interested in a recessive trait, this individual could be considered a(n) carrier, because he/she would not show the trait but could pass it on. 2. If the offspring of two pure-breeding parents have a phenotype which is intermediate between the two parent phenotypes, we say this gene shows incomplete dominance.
T□ F■ 27. Recessive traits are very rare, because it is necessary to inherit two recessive alleles in order to show the trait phenotypically. T■ F□ 28. If a woman who has a genetic disease and is heterozygous for the disease allele marries a man who does not have the disease, there is a 50-50 chance their first child will have the disease. T■ F□ 29. In incomplete dominance, a heterozygous individual has a phenotype which is intermediate between the two homozygous phenotypes. Matching: 1. Below are results from some crosses, some of which would have surprised Mendel a bit. Match each with the term that best describes what’s going on. B Two pure-breeding parents are crossed. All offspring have a phenotype that is different from either parent. a. complete dominance b. incomplete dominance c. codominance d. overdominance e. multiple alleles f. dihybrid cross g. can’t happen C A child with blood type AB is born to a type A parent and a type B parent. E A child with blood type O is born to a type A parent and a type B parent. A In a cross between two parents with the same phenotype, ¾ of the offspring resemble the parents and ¼ do not. Fill in the blank: 1. If an individual’s two alleles for a given gene are different, we say that individual is heterozygous. If we’re interested in a recessive trait, this individual could be considered a(n) carrier, because he/she would not show the trait but could pass it on. 2. If the offspring of two pure-breeding parents have a phenotype which is intermediate between the two parent phenotypes, we say this gene shows incomplete dominance.