Use the following information for questions 8 to 10. The loka-loka flower is bea
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Question
Use the following information for questions 8 to 10. The loka-loka flower is beautiful to behold, but beware! Four different loci are known. The Anther locus determines anther size: the A allele is fully dominant and makes huge anthers; aa homozygotes make small anthers. The Black locus determines petal color: the B allele is fully dominant and makes a deep black pigment; bb homozygotes are light purple. The Color locus determines if any color pigment is deposited in the petals: the C allele allows the pigment to be deposited, whether that is black or purple; cc homozygotes are albino, regardless of pigment alleles at any other loci (i.e., Color is epistatic to the Black locus). The Deadly locus determines if a toxin is produced in the petals: the D allele makes the toxin and the d allele does not; DD genotypes make two doses of toxin (lethal to all who breath the lovely scent), heterozygotes make only one dose of toxin (not lethal, but causes sickness), and dd homozygotes are harmless. The Anther and Black loci are very closely linked on chromosome I (such that recombination can be ignored—i.e., there is essentially no recombination between these loci), Color is on chromosome II, and Deadly is on chromosome III. A cross is set up between two true- breeding lines: Line 1 has big anthers and black petals that produce a lethal dose of toxin. Line 2 has small anthers and albino petals that are non-toxic. From previous crosses, you also know that Line 2 is homozygous recessive at the Black locus. The F1 progeny of this cross are then selfed to produce an F2 generation.8. What is the probability of getting a plant in the F2 that has big anthers and black petals? [For this question, ignore the Deadly locus.]
A. 9/64
B. 27/64
C. 9/16
D. 3/4
E. 15/32
F. Essentially 0
G. None of the above
9. What is the probability of getting a plant in the F2 that has big anthers and albino petals that make you sick but are not lethal?
A. 1/256
B. 9/256
C. 9/128
D. 3/32
E. 3/64
F. Essentially 0
G. None of the above
10. What is the probability of getting a plant in the F2 that has big anthers and light purple petals that are non-toxic?
A. 1/256
B. 9/256
C. 9/128
D. 3/32
E. Essentially 0
F. 1.0 (i.e. certainty)
G. None of the above
Explanation / Answer
Use the following information for questions 8 to 10. The loka-loka flower is beautiful to behold, but beware! Four different loci are known. The Anther locus determines anther size: the A allele is fully dominant and makes huge anthers; aa homozygotes make small anthers. The Black locus determines petal color: the B allele is fully dominant and makes a deep black pigment; bb homozygotes are light purple. The Color locus determines if any color pigment is deposited in the petals: the C allele allows the pigment to be deposited, whether that is black or purple; cc homozygotes are albino, regardless of pigment alleles at any other loci (i.e., Color is epistatic to the Black locus). The Deadly locus determines if a toxin is produced in the petals: the D allele makes the toxin and the d allele does not; DD genotypes make two doses of toxin (lethal to all who breath the lovely scent), heterozygotes make only one dose of toxin (not lethal, but causes sickness), and dd homozygotes are harmless. The Anther and Black loci are very closely linked on chromosome I (such that recombination can be ignored—i.e., there is essentially no recombination between these loci), Color is on chromosome II, and Deadly is on chromosome III.
A cross is set up between two true- breeding lines:
Line 1 has big anthers and black petals that produce a lethal dose of toxin
AA BB CC DD
. Line 2 has small anthers and albino petals that are non-toxic.
aa bb cc dd
From previous crosses, you also know that Line 2 is homozygous recessive at the Black locus. The F1 progeny of this cross are then selfed to produce an F2 generation.
Aa Bb Cc Dd-------------F 1 OFFSPRING
Aa Bb Cc Dd- X Aa Bb Cc Dd
AA BB
8. What is the probability of getting a plant in the F2 that has big anthers and black petals? [For this question, ignore the Deadly locus.]
A. 9/64
B. 27/64
C. 9/16
D. 3/4
E. 15/32
F. Essentially 0
G. None of the above
9. What is the probability of getting a plant in the F2 that has big anthers and albino petals that make you sick but are not lethal?
A. 1/256
B. 9/256
C. 9/128
D. 3/32
E. 3/64
F. Essentially 0
G. None of the above
10. What is the probability of getting a plant in the F2 that has big anthers and light purple petals that are non-toxic?
A. 1/256
B. 9/256
C. 9/128
D. 3/32
E. Essentially 0
F. 1.0 (i.e. certainty)
G. None of the above
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