Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter12: Mendel, Genes, And Inheritance
Section: Chapter Questions
Problem 9TYK: The ability of humans to taste the bitter chemical phenylthiocarbamide (PTC) is a genetic trait....
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Transcribed Image Text:1. In a plant species, flower-colour is determined by the biochemical pathway shown below:
E
В
C
Colourless
orange
pink
purple
green
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 D,
while the recessive allele e has no effect.
a)
Determine the F1 and F2 phenotypes from a cross between AABBccDDEE and AABBCCDDee plants.
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 > RD > 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?
black female x tan male produce 1412 black females: 502 white females: 1766 tan males
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