{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 6 Questions - Lecture 6 Study Questions 1 How do...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 6 : Study Questions 1. How do incomplete dominance and codominance differ? 2. What is incomplete penetrance and what causes it? 3. What is gene interaction? What is the difference between an epistatic gene and a hypostatic gene? 4. What is a recessive epistatic gene? 5. What is a complementation test and what is it used for? 6. What characteristics are exhibited by a cytoplasmically inherited trait? 7. Palomino horses have a golden yellow coat, chestnut horses have a brown coat,and cremello horses have a coat that is almost white. A series of crosses between thethree different types of horses produced the following offspring: palomino X palomino = 13 palomino, 6 chestnut, 5 cremello chestnut X chestnut = 16 chestnut cremello X cremello = 13 cremello palomino X chestnut = 8 palomino, 9 chestnut palomino X cremello = 11 palomino, 11 cremello chestnut X cremello = 23 palomino a. Explain the inheritance of the palomino, chestnut, and cremello phenotypes in horses. b. Assign symbols for the alleles that determine these phenotypes and list the genotypes of all parents and offspring given in the preceding table. 8. The L M and L N alleles at the MN blood group locus exhibit codominance. Give the expected genotypes and phenotypes and their ratios in progeny resulting from the following crosses: a. L M L M X L M L N b. L N L N X L N L N c. L M L N X L M L N d. L M L N X L N L N e. L M L M X L N L N 9. Assume that long ear lobes in humans are an autosomal dominant trait that exhibits 30% penetrance. A person who is heterozygous for long ear lobes mates with a person who is homozygous for normal ear lobes. What is the probability that their first child will have long ear lobes? 10. The eastern mosquito fish ( Gambusia affinis holbrooki ) has XX-XY sex determination. Its spotting is inherited as a Y-linked trait. The trait exhibits 100% penetrance when the fish are raised at 22° C, but the penetrance drops to 42% when the fish are raised at 26° C. A male with spots is crossed with a female without spots, and the F1 are intercrossed to produce the F2. If all the offspring are raised at 22° C, what proportion of the F1 and F2will have spots? If all the offspring are raised at 26° C, what proportion of the F1 and F2 will have spots?
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
11. When a Chinese hamster with white spots is crossed with another hamster that has no spots, approximately 1/2 of the offspring have white spots and 1/2 have no spots. When two
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern