d) What type of epistasis is being demonstrated in this question? e) Assume that another allelic pair in snails also determines shell color in addition to the two genes mentioned above. The presence of the dominant, R, produces red shells. Its recessive allele, r, produces yellow shells. What would be the phenotypes of the following snails in relation to shell color? i. AaBbRr ii. AaBbrr iii. aaBBRR

Human Anatomy & Physiology (11th Edition)
11th Edition
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Chapter1: The Human Body: An Orientation
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answer parts d and e please

In snails, the two allelic pairs A, a and B, b are known to affect pigment
deposition in the adult's shell.
The diagram illustrates the pathway where the dominant alleles A & B, are
both necessary for colored shell.
Absence of either results in white shells.
A_snails
Compound A-Enzyme I-
aa snails
B_snails
Compound B-Enzyme II Compound C
bb snails
a) What is the genotype and phenotype (Colored or white) of a dihybrid snail for these two loci? Genotype
Phenotype
b) A colleague hands you a white snail and assures you that it is heterozygous at the "A" locus. What is the genotype of the snail?
iii. aaBBRR
c) What kind of shells, colored or white, are to be expected from a cross of two double heterozygotes (dihybrids) for genes A and B and in
what ratio?
d) What type of epistasis is being demonstrated in this question?
e) Assume that another allelic pair in snails also determines shell color in addition to the two genes mentioned above. The presence of the
dominant, R, produces red shells. Its recessive allele, r, produces yellow shells.
What would be the phenotypes of the following snails in relation to shell color?
i. AaBbRr
ii. AaBbrr
Transcribed Image Text:In snails, the two allelic pairs A, a and B, b are known to affect pigment deposition in the adult's shell. The diagram illustrates the pathway where the dominant alleles A & B, are both necessary for colored shell. Absence of either results in white shells. A_snails Compound A-Enzyme I- aa snails B_snails Compound B-Enzyme II Compound C bb snails a) What is the genotype and phenotype (Colored or white) of a dihybrid snail for these two loci? Genotype Phenotype b) A colleague hands you a white snail and assures you that it is heterozygous at the "A" locus. What is the genotype of the snail? iii. aaBBRR c) What kind of shells, colored or white, are to be expected from a cross of two double heterozygotes (dihybrids) for genes A and B and in what ratio? d) What type of epistasis is being demonstrated in this question? e) Assume that another allelic pair in snails also determines shell color in addition to the two genes mentioned above. The presence of the dominant, R, produces red shells. Its recessive allele, r, produces yellow shells. What would be the phenotypes of the following snails in relation to shell color? i. AaBbRr ii. AaBbrr
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