Instructions

There are two genes that influence a particular type of plant, one controlling blue (B = dominant) versus white (b = recessive) petals and the other controlling round (R = dominant) versus oval (r = recessive) leaves are autosomally linked and are 15 map units apart. You cross a homozygous blue-oval plant with a homozygous white-round plant. You then cross the F1 offspring with homozygous white-round plants and obtain 1000 progeny. LIST the possible phenotypes produced by this cross and indicate exactly how many of each phenotype you would expect to see within these 1000 progeny? (give numbers – not ratios)   (4)

26. Acnuts have a diploid number of 6. Genes A, B and D are together on one of chromosomes, genes E and F are together on another chromosome, and gene R located on a third chromosome. Consider an acnut with genotype AABBddEEffRR. How many genetically different gametes could this individual produce if CROSS-OVER NEVER OCCURS?   (2)

A. How many genetically different gametes could this individual produce if CROSS-OVER DOES OCCUR? (2)
B. Consider an acnut with genotype AaBbddEEffRr. How many genetically different gametes could this individual produce if CROSS-OVER NEVER OCCURS?   (2)

27. Werewolfism (t) is a recessive sex-linked trait. A normal man marries a normal woman. Little does he know that her father was a werewolf! What is the predicted ratio of GENOTYPES and PHENOTYPES of the children of this couple? SHOW how you got your answer using a punnett square. (5)

Punnett square:

ratio of genotypes ratio of phenotypes


28. Imagine that you have done the crosses necessary to determine if the fur color gene is (or is not) sex-linked. You then discover a third allele for the fur color gene in seals. This allele (b) produces blue fur and is recessive to the other two alleles.   What is the easiest method for determining whether or not this allele is sex-linked? Remember that you want to save time and money. (Hint: this is a trick question.) (2)

Order with us today for a quality custom paper on the above topic or any other topic!

What Awaits you:

• High Quality custom-written papers

• Automatic plagiarism check

• On-time delivery guarantee

• Masters and PhD-level writers

• 100% Privacy and Confidentiality