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ed above. The recessive al the action of gene C, whi

ed above. The recessive al the action of gene C, whi

Human Anatomy & Physiology (11th Edition)
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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1. In a plant species, flower-colour is determined by the biochemical pathway shown below: E A Colourless yellow orange red purple Genes A, B, C, D, and E are independently assorting. The dominant alleles A, B, C and D encode enzymes that catalyse the corresponding reactions indicated above. The recessive alleles a, b, c and d are non-functional and do not produce active enzymes. The dominant E allele totally inhibits the action of gene C, while the recessive allele e has no effect. a) Determine the F1 and F2 phenotypes from a cross between AABBCCDDEE and AABBCCDDee plants. b) What proportion of the offspring of an AABBCCDDEE x AABBCCDDEE cross is expected to have coloured flowers? 2. In a species of beetles, individuals may be red, black, white or tan. Colour is controlled by a single gene with multiple alleles in a dominance series. Red (R) is dominant to black (Rb), black is dominant to white (RW) and white is dominant to tan (r) (R > Rb > RW > r). Colour variation in this species is a female sex-limited trait. Males carry the colour genes but are always phenotypically tan regardless of their genotype. What are the genotypes of the parents of the following cross? tan female x tan male produces 78 red females: 70 white females: 184 tan males
Transcribed Image Text:1. In a plant species, flower-colour is determined by the biochemical pathway shown below: E A Colourless yellow orange red purple Genes A, B, C, D, and E are independently assorting. The dominant alleles A, B, C and D encode enzymes that catalyse the corresponding reactions indicated above. The recessive alleles a, b, c and d are non-functional and do not produce active enzymes. The dominant E allele totally inhibits the action of gene C, while the recessive allele e has no effect. a) Determine the F1 and F2 phenotypes from a cross between AABBCCDDEE and AABBCCDDee plants. b) What proportion of the offspring of an AABBCCDDEE x AABBCCDDEE cross is expected to have coloured flowers? 2. In a species of beetles, individuals may be red, black, white or tan. Colour is controlled by a single gene with multiple alleles in a dominance series. Red (R) is dominant to black (Rb), black is dominant to white (RW) and white is dominant to tan (r) (R > Rb > RW > r). Colour variation in this species is a female sex-limited trait. Males carry the colour genes but are always phenotypically tan regardless of their genotype. What are the genotypes of the parents of the following cross? tan female x tan male produces 78 red females: 70 white females: 184 tan males
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