Zebrafish normally have a black striped pattern, but there is a recessive allele (c) in a pigmentation gene that leads to colorless zebrafish. The wildtype allele is dominant and encodes an enzyme involved in pigment production which leads to fish having the typical striped pattern (C). A second gene, controls dorsal fin development. The dominant allele for this gene (D) leads to a normal dorsal fin, but a recessive allele for this gene leads to the absence of a dorsal fin (d). A striped female fish with a dorsal fin was crossed to a colorless male fish lacking a dorsal fin. The following table gives the phenotypes of the resulting F1 progeny. Phenotypes of F1 Fish Striped with dorsal fin Striped without dorsal fin Colorless with dorsal fin Colorless without dorsal fin # of Pups 150 148 152 155 What are the most likely genotypes of the parents (P generation)? Female Genotype: Male Genotype: If a female F1 striped fish with a dorsal fin were back-crossed to the colorless male parent that lacks a dorsal fin, what genotypic ratio would you expect to see in the F2 progeny? If a female F1 striped fish with a dorsal fin were back-crossed to the colorless male parent that lacks a dorsal fin, what phenotypic ratio would you expect to see in the F2 progeny?
Zebrafish normally have a black striped pattern, but there is a recessive allele (c) in a pigmentation gene that leads to colorless zebrafish. The wildtype allele is dominant and encodes an enzyme involved in pigment production which leads to fish having the typical striped pattern (C). A second gene, controls dorsal fin development. The dominant allele for this gene (D) leads to a normal dorsal fin, but a recessive allele for this gene leads to the absence of a dorsal fin (d). A striped female fish with a dorsal fin was crossed to a colorless male fish lacking a dorsal fin. The following table gives the phenotypes of the resulting F1 progeny. Phenotypes of F1 Fish Striped with dorsal fin Striped without dorsal fin Colorless with dorsal fin Colorless without dorsal fin # of Pups 150 148 152 155 What are the most likely genotypes of the parents (P generation)? Female Genotype: Male Genotype: If a female F1 striped fish with a dorsal fin were back-crossed to the colorless male parent that lacks a dorsal fin, what genotypic ratio would you expect to see in the F2 progeny? If a female F1 striped fish with a dorsal fin were back-crossed to the colorless male parent that lacks a dorsal fin, what phenotypic ratio would you expect to see in the F2 progeny?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:QUESTION 3
Zebrafish normally have a black striped pattern, but there is a recessive allele (c) in a pigmentation gene that leads to colorless zebrafish. The wildtype allele is
dominant and encodes an enzyme involved in pigment production which leads to fish having the typical striped pattern (C). A second gene, controls dorsal fin
development. The dominant allele for this gene (D) leads to a normal dorsal fin, but a recessive allele for this gene leads to the absence of a dorsal fin (d). A
striped female fish with a dorsal fin was crossed to a colorless male fish lacking a dorsal fin. The following table gives the phenotypes of the resulting F1 progeny.
Phenotypes of F1 Fish
Striped with dorsal fin
Striped without dorsal fin
Colorless with dorsal fin
Colorless without dorsal fin
# of Pups
150
148
152
155
What are the most likely genotypes of the parents (P generation)?
Female Genotype:
Male Genotype:
If a female F1 striped fish with a dorsal fin were back-crossed to the colorless male parent that lacks a dorsal fin, what genotypic ratio would you expect to see in
the F2 progeny?
If a female F1 striped fish with a dorsal fin were back-crossed to the colorless male parent that lacks a dorsal fin, what phenotypic ratio would you expect to see
in the F2 progeny?
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