Here are 6 seperate problems on Genetics. Can anyone figure any of them out?
1. In two sweet peas strains, B = blue flowers, b = red flowers, L = long pollen grains, and l = round pollen grains. In across between a heterozygous plant with blue flowers and long pollen grains (BbLl) and a plant with red flowers and round pollen grains (bbll) the following offspring rations were seen:
40 blue long (BbLl)
48 red, round (bbll)
3 blue, round (Bbll)
9 red, long (bbLl)
What is the recombination frequency (and map units distance) between these 2 genes. Show the math to prove your answer.
Note: Don't forget the percentage.
2. Derive a partial genetic map of a Drosophila chromosome #2 based on the following recombination frequencies:
Bristles-Body Color: 49
Bristles-Eye Color: 58
Bristles-Wing Pattern: 62
Body Color-Eye Color: 9
Body Color Wing Pattern: 13
Eye-Color Wing Pattern: 4
Drosophila Chromosome #2
Distances:
_____________________________________________________
Gene order:
3. A geneticist crossed a homozygous red petunia with a homozygous white petunia and all of the offspring were pink petunia's.
a. Using R for red, and r for white, show how the genotype of the parental flowers and the Punnet Square that produced the offspring.
b. Explain how the phenomena is possible?
4. Hemophilla is an X-linked recessive disorder. A normal women whose father ws a hemophilic marries a normal man. They have a hemophilic son. The man claims his wife has been unfaithful. If you were the judge, how would you rule and why?
5. Can two individuals with type A blood produce any children with:
a. type O blood? Why or why not?
b. type B blood? Why or why not?
6. Huntington's disease is a degenerative disease of the nervous system that strikes in the middle age. The allele that causes the disease (H) is dominant to the allele that results in the normal condition (h). Answer the following questions about the inheritance of this disease:
a. What is the genotype of a man who is normal but whose father had Huntington's disease?
b. What is the genotype of a woman who has Huntington's disease if both her parents had Huntington's disease?
c. If a man who is heterozygous for Huntington's disease marries a woman who is normal, what would you expect for the genotypes and the phenotypes of their children?
That's it...
1. In two sweet peas strains, B = blue flowers, b = red flowers, L = long pollen grains, and l = round pollen grains. In across between a heterozygous plant with blue flowers and long pollen grains (BbLl) and a plant with red flowers and round pollen grains (bbll) the following offspring rations were seen:
40 blue long (BbLl)
48 red, round (bbll)
3 blue, round (Bbll)
9 red, long (bbLl)
What is the recombination frequency (and map units distance) between these 2 genes. Show the math to prove your answer.
Note: Don't forget the percentage.
2. Derive a partial genetic map of a Drosophila chromosome #2 based on the following recombination frequencies:
Bristles-Body Color: 49
Bristles-Eye Color: 58
Bristles-Wing Pattern: 62
Body Color-Eye Color: 9
Body Color Wing Pattern: 13
Eye-Color Wing Pattern: 4
Drosophila Chromosome #2
Distances:
_____________________________________________________
Gene order:
3. A geneticist crossed a homozygous red petunia with a homozygous white petunia and all of the offspring were pink petunia's.
a. Using R for red, and r for white, show how the genotype of the parental flowers and the Punnet Square that produced the offspring.
b. Explain how the phenomena is possible?
4. Hemophilla is an X-linked recessive disorder. A normal women whose father ws a hemophilic marries a normal man. They have a hemophilic son. The man claims his wife has been unfaithful. If you were the judge, how would you rule and why?
5. Can two individuals with type A blood produce any children with:
a. type O blood? Why or why not?
b. type B blood? Why or why not?
6. Huntington's disease is a degenerative disease of the nervous system that strikes in the middle age. The allele that causes the disease (H) is dominant to the allele that results in the normal condition (h). Answer the following questions about the inheritance of this disease:
a. What is the genotype of a man who is normal but whose father had Huntington's disease?
b. What is the genotype of a woman who has Huntington's disease if both her parents had Huntington's disease?
c. If a man who is heterozygous for Huntington's disease marries a woman who is normal, what would you expect for the genotypes and the phenotypes of their children?
That's it...
