A woman who has normal vision and is heterozygous for colour blindness has children with a man who is colour blind. What is the expected ratio of genotypes among their children? X° X° :X° X° : X° Y: X° y 1 : 1 : : 1 xC xC : X° Y : xC Y : 1: 2 : 1 XC x° :XC Y : XC y 2 : 1 : 1 xC xC :xC xc : XC y 1: 1 : 2

Colour blindness is caused by a sex-linked, recessive gene. If a woman, whose father was colour blind, marries a man with normal colour vision, what percentage of their children will be colour blind? Show using a Punnet square cross

What is the genotype of the parents of the corn dihybrid cross described above? What are the phenotypes of the parents of the corn dihybrid cross described above? What are the possible genotypes of the parent gametes of the corn dihybrid cross described above?

Additional problems (Chapter 4 (Extension of Mendelian Inheritance): 1. In rabbits, coloration of the fur depends on alleles of the gene c. From information given in the chapter, what phenotypes and proportions would be expected from the following crosses: a) CC X cc b) Cc x Cc c) Cc x Ccch d) cc x cc 2. From the information given in the chapter about the ABO blood types, what phenotypes and ratios are expected from the following matings: a) type AB x type O b) Type AB x type B individual whose mother is type O c) Type O x Type A individual whose father is type O d) Type Ox type O 3. A woman with type AB blood type gave birth to a baby with type B blood. Two different men claim to be the father. One has type A blood and the other type B blood. Can the genetic evidence decide in favor of either? 4. You have been studying a trait that seems to be present in every generation within a particular family. Further, you have observed that every affected offspring has at least affected parent…

An individual with the genotype AA is crossed with an individual with the genotype Aa, producing 120 offspring. The number of offspring with genotype AA will be close to * O 120 90 O 60 30

Jenny's maternal uncle (her mother's brother) is affected with a rare x-linked disease, but no one else in the family is.  What is the percent chance that Jenny is a carrier of this disease? Enter a whole number between 0 and 100.  For example, if you enter 33, it means you think there is 33% chance that Jenny is carrier.