Erma and Harvey were a compatible barnyard pair, but a curious sight. Harvey’s tail was only 6 cm long, while Erma’s was 30 cm. Their F1 piglet offspring all grew tails that were 18 cm. When inbred, an F2 generation resulted in many piglets (Erma and Harvey’s grandpigs), whose tails ranged in 4-cm intervals from 6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails, while 1/64 had 6-cm tails and 1/64 had 30-cm tails. (a) Explain how these tail lengths were inherited by describing the mode of inheritance, indicating how many gene pairs were at work, and designating the genotypes of Harvey, Erma, and their 18-cm-tail offspring. (b) If one of the 18-cm-tail F1 pigs is mated with one of the 6-cm-tail F2 pigs, what phenotypic ratio will be predicted if many offspring resulted? Diagram the cross.

Human Anatomy & Physiology (11th Edition)
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Erma and Harvey were a compatible barnyard pair, but a curious
sight. Harvey’s tail was only 6 cm long, while Erma’s was 30 cm.
Their F1 piglet offspring all grew tails that were 18 cm. When
inbred, an F2 generation resulted in many piglets (Erma and
Harvey’s grandpigs), whose tails ranged in 4-cm intervals from
6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails,
while 1/64 had 6-cm tails and 1/64 had 30-cm tails.
(a) Explain how these tail lengths were inherited by describing
the mode of inheritance, indicating how many gene pairs were at
work, and designating the genotypes of Harvey, Erma, and their
18-cm-tail offspring.
(b) If one of the 18-cm-tail F1 pigs is mated with one of the
6-cm-tail F2 pigs, what phenotypic ratio will be predicted if
many offspring resulted? Diagram the cross.

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