In an alien species, eye colors can be black, white, or gray. A white-eyed mother and a black-eyed father have all gray-eyed children. a. What genetic pattern is most likely demonstrated here? b. A gray-eyed couple has two babies: one white-eyed and one black-eyed. Does this confirm or deny your answer to part A? If necessary, revise your hypothesis. C. A gray-eyed alien and her black-eyed husband want a white-eyed baby. Is this possible? 5.

STUDY GUIDE Name a A HUMAN TRAITS In your textbook, read about color blindness in Section 27:2. 1. Color blindness is a trait carried on the sex chromosomes. Let C be normal color vision and c b red-green color blindness. Use the diagrams to answer the questions. a. What is the sex of each of these people? Write either male or female on the blank below each. XX XX X Xa XX C b. Which are red-green color blind? c. Which have normal color vision? X X XXXXX B ①① X X XXXXX M a XaXa Date a d. Which has normal color vision even with the gene for color blindness? 2. a. Complete the following Punnett squares. The first one has been done for you. b. Using these colors, shade the following parts of the Punnett squares. Blue-normal females Yellow-normal males Red-color blind females Green-color blind males X X XXXXX Class D CHAPTER 27 X X XXXXX a Xalo E X X X×××× X oooolgolma 8 X X XXXXX a X a Xa 15 1

Suppose that a Mendel's dihybrid cross between two double heterogotes (AaBb  x AaBb) gave you the phenotypic ratio of 15:1, assuming that the dominant allele is completely dominant over the recessive allele. Which of the following is CORRECT?     A. The A_B_ and aabb have the same phenotype. (_ means either the dominant allele or recessive allele)   B. The aaB_ and aabb have the same phenotype. (_ means either the dominant allele or recessive allele)   C. The aaB_ and A_bb have the same phenotype. (_ means either the dominant allele or recessive allele)   D. All of the above.

The questions below all refer to the following pedigree. The locus for allele D/d determines how cilia function within the body. Mutations at this allele cause abnormal ciliary function, resulting in a clinical disorder characterized by frequent respiratory infections (including in the ears, sinuses, and lungs), as well as infertility. In the pedigree, black circles/squares represent individuals affected by the disorder. White circles/squares represent unaffected individuals. Remember, if a trait is rare in a population (such as this one), we assume individuals marrying into the family are NOT carriers unless the information provided indicates otherwise. A1 A2 II B1 B2 B3 B4. B5 B6_ II C1. C2 C3. C4. C5 IV D1. D2, D4 . D5 Individuals C2 and C3 are considering having additional children. However, having already had a child with this disorder, they visit a genetic counselor to determine what the probability is that their future child would have the disorder. If C2 and C3 have another…