First Experiment

1		Occasionally, Morgan observed female flies that had eosin eyes that were deeper in color than normal homozygous females. If this was not due to a new mutation within the eye color gene, what composition of sex chromosomes in such a female would explain this phenotype?
			A)	XXY
			B)	XO
			C)	XXX
			D)	XX
2		If Morgan and Bridges had crossed female offspring from Cross C to males with white eyes, what would be the expected ratios among the resulting offspring?
			A)	1 white-eyed male : 1 light-eosin eyed male : 2 light-eosin eyed females
			B)	1 white-eyed male : 1 light-eosin eyed male : 1 white-eyed female : 1 light- eosin eyed female
			C)	2 light-eosin eyed males: 2 light-eosin eyed females
			D)	2 light-eosin eyed males: 1 white-eyed female : 1 light-eosin eyed female
3		If Morgan and Bridges had crossed female offspring from Cross B to males with white eyes, what would be the expected ratios among the resulting offspring?
			A)	1 red-eyed male : 1 light-eosin eyed male : 1 red-eyed female : 1 light-eosin eyed female
			B)	1 white-eyed male : 1 light-eosin eyed male : 1 white-eyed female : 1 light- eosin eyed female
			C)	2 light-eosin eyed males : 2 light-eosin eyed females
			D)	2 light-eosin eyed males : 1 white-eyed female : 1 light-eosin eyed female
4		If Morgan and Bridges had crossed white-eyed females to males with light-eosin eyes, what would be the expected ratios among the resulting offspring?
			A)	2 light-eosin eyed males : 2 light-eosin eyed females
			B)	1 white-eyed male : 1 light-eosin eyed male : 1 white-eyed female : 1 light- eosin eyed female
			C)	2 white-eyed males : 2 light-eosin eyed females
			D)	2 light-eosin eyed males : 1 white-eyed female : 1 light-eosin eyed female
5		The white-eyed allele does not show a gene dosage effect because
			A)	It can be found in only one copy in a female fly.
			B)	Two copies in the female results in zero pigment, just like one copy.
			C)	The red allele is dominant to the white allele.
			D)	The white allele mutates very frequently.

Second Experiment

6		If the effect of the recessive cream allele is to lower pigment synthesis, explain why it doesn't affect red eye color.
			A)	The red allele is always homozygous.
			B)	The red allele causes such a large amount of pigment that a small reduction is not phenotypically detectable.
			C)	The red allele increases its copy number in the presence of the cream allele.
			D)	None of the above
7		If Bridges had crossed a female fly that was homozygous for the cream (ca) and eosin alleles to a male that had red eyes and was homozygous for the cream (ca) allele, what would be the expected ratios in the offspring?
			A)	2 males with cream-colored eyes : 2 females with red eyes
			B)	8 red-eyed females : 4 red-eyed males : 3 light-eosin eyed males : 1 cream- eyed male
			C)	9 red-eyed females : 3 red-eyed males : 3 light-eosin eyed males : 1 cream- eyed male
			D)	2 males with eosin eyes : 2 females with red eyes
8		Which of the following alleles would you guess to have a decreased level of protein function?
			A)	eosin and red
			B)	eosin and C
			C)	eosin and ca
			D)	red and ca
9		If Bridges had crossed a female fly that was homozygous for the cream (ca) and white alleles to a male that had cream-colored eyes, what would be the expected ratios in the offspring?
			A)	2 males with white eyes : 2 females with light-eosin eyes
			B)	8 light eosin-eyed females : 4 (dark) eosin-eyed males : 3 light-eosin eyed males : 1 cream-eyed male
			C)	2 (dark) eosin-eyed females : 2 white-eyed males
			D)	2 males with white eyes : 2 females with cream eyes
10		If Bridges had crossed a female fly with white eyes that was heterozygous for the C and ca alleles to a male that had cream-colored eyes, what would be the expected ratios in the offspring?
			A)	2 males with white eyes : 2 females with light-eosin eyes
			B)	8 light eosin-eyed females : 4 (dark) eosin-eyed males : 3 light-eosin eyed males : 1 cream-eyed male
			C)	1 light eosin-eyed female : 1 cream-eyed female : 2 white-eyed males
			D)	2 males with white eyes : 2 females with cream eyes