Question

Column: A             B                      C                     D                        E

F2 Phenotype	# Observed	Corresponding Genotype	P or SCO or DCO	Genotype Written in Correct Order on Homologs
yellow	310	ywv+l+	P
wildtype	32
yellow, wavy	150
wavy, large	320
wavy	16
large	120
yellow, large	14
yellow, wavy, large	38
Total	1000

a) How many sets of reciprocal phenotypes are shown? ____________________

b) In Column C, list the corresponding genotype. Account for all three traits. The first one has been provided for you as an example. For all answers in column C, use the order of traits: fur color, fur texture, ear size.

c) Indicate the type of each homolog in Column D: parental P, single crossover SCO, or double crossover DCO. The first one has been provided for you as an example.

d) On this form below or on blank paper to be submitted with this form, determine the correct order of all three genes. All work must be shown for credit. Fill in Column E above.

e) After you have determined the correct order of alleles on the parent homologs, use this to determine the map distance between the gene in the middle and those on either side of it. Set up and show all calculations. Draw the map and label the distances between the alleles:

Answer 1

F2 phenotype	# observed	Corresponding genotype	P or SCO or DCO	Genotype written in correct order
yellow	310	ywv+l+	P	ywl+v+
wildtype	32	yw+v+l+	SCO	yw+l+v+
yellow, wavy	150	ywvl+	SCO	ywl+v
wavy, large	320	yw+vl	P	yw+lv
wavy	16	yw+vl+	DCO	yw+l+v
large	120	yw+v+l	SCO	yw+lv+
yellow, large	14	ywv+l	DCO	ywlv+
yellow, wavy, large	38	ywvl	SCO	ywlv
Total	1000

Distance between yw and l

38+32+14+16/1000 * 100 = 10cM

Distance between l and v

150+120+14+16/1000 * 100 = 30cM

Gene order

yw------10cM-----l-------------------30cM-----------------v