The following, regarding a cross between a pig pair, whose tail were 6 (Harvey) and 30 centimeter (Erma) in length. (a) The mode of inheritance of tail in the progeny, number of gene pairs involved, and designation of genotypes of the parents and their 18 cm tail offspring (F1). (b) The phenotypic ratio of a cross between 18 cm tail F1 pig and 6 cm tail F2 pig giving a cross diagrammatically. Introduction: In the given case, two pigs were bred whose tail were 6 and 30 cm in length. Their F1 generation bore piglets with 18 cm tail. The F2 generation of the inbred bore piglets with tails in the range of 6-30 cm, each at an interval of 4 cm (6, 10, 14, 18, 26, and 30). A majority of the F2 offspring had 18 cm tail and 1/64 had 6 and 30 cm tail.

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Chapter 21, Problem 7PDQ

Summary Introduction

To review:

The following, regarding a cross between a pig pair, whose tail were 6 (Harvey) and 30 centimeter (Erma) in length.

(a) The mode of inheritance of tail in the progeny, number of gene pairs involved, and designation of genotypes of the parents and their 18 cm tail offspring (F1).

(b) The phenotypic ratio of a cross between 18 cm tail F1 pig and 6 cm tail F2 pig giving a cross diagrammatically.

Introduction:

In the given case, two pigs were bred whose tail were 6 and 30 cm in length. Their F1 generation bore piglets with 18 cm tail. The F2 generation of the inbred bore piglets with tails in the range of 6-30 cm, each at an interval of 4 cm (6, 10, 14, 18, 26, and 30). A majority of the F2 offspring had 18 cm tail and 1/64 had 6 and 30 cm tail.

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Erma and Harvey were a compatible barnyard pair, but a curioussight. 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. Wheninbred, an F2 generation resulted in many piglets (Erma andHarvey’s grandpigs), whose tails ranged in 4-cm intervals from6 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. Que: Explain how these tail lengths were inherited by describingthe mode of inheritance, indicating how many gene pairswere at work, and designating the genotypes of Harvey,Erma, and their 18-cm-tail offspring.

Erma and Harvey were a compatible barnyard pair, but a curioussight. 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. Wheninbred, an F2 generation resulted in many piglets (Erma andHarvey’s grandpigs), whose tails ranged in 4-cm intervals from6 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. Que: If one of the 18-cm F1 pigs is mated with one of the 6-cmF2 pigs, what phenotypic ratio would be predicted if manyoffspring resulted? Diagram the cross.

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