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In hyenas, long manes (a) are recessive to short manes (A) and having round ears (b) is recessive to having pointy ears (B). A hyena with a long mane that is homozygous for pointy ears is crossed with a hyena that has round ears and is homozygous for a short mane. The F1 progeny are then crossed with hyenas that have long manes and round ears (a testcross). PART A. If the loci for mane length and ear shape are on different chromosomes, what ratio would you expect from the testcross? PART B. Let's say instead that the genes for mane length and ear shape are located on the same chromosome, and findings from mapping experiments indicate that they are 16 m.u. apart. Assume 180 offspring are produced in testcrosses, what is the number of progeny expected for each phenotypic class? PART C. Is the F1 progeny in coupling or repulsion? Explain. Give the genotype of the F1 progeny of the parental cross, using notation that shows linkage.

In hyenas, long manes (a) are recessive to short manes (A) and having round ears (b) is recessive to having pointy ears (B). A hyena with a long mane that is homozygous for pointy ears is crossed with a hyena that has round ears and is homozygous for a short mane. The F1 progeny are then crossed with hyenas that have long manes and round ears (a testcross). PART A. If the loci for mane length and ear shape are on different chromosomes, what ratio would you expect from the testcross? PART B. Let's say instead that the genes for mane length and ear shape are located on the same chromosome, and findings from mapping experiments indicate that they are 16 m.u. apart. Assume 180 offspring are produced in testcrosses, what is the number of progeny expected for each phenotypic class? PART C. Is the F1 progeny in coupling or repulsion? Explain. Give the genotype of the F1 progeny of the parental cross, using notation that shows linkage.

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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In hyenas, long manes (a) are recessive to short manes (A) and having round ears (b) is recessive to having pointy ears (B). A hyena with a long mane that is homozygous for pointy ears is crossed with a hyena that has round ears and is homozygous for a short mane. The F1 progeny are then crossed with hyenas that have long manes and round ears (a testcross). PART A. If the loci for mane length and ear shape are on different chromosomes, what ratio would you expect from the testcross? PART B. Let's say instead that the genes for mane length and ear shape are located on the same chromosome, and findings from mapping experiments indicate that they are 16 m.u. apart. Assume 180 offspring are produced in testcrosses, what is the number of progeny expected for each phenotypic class? PART C. Is the F1 progeny in coupling or repulsion? Explain. Give the genotype of the F1 progeny of the parental cross, using notation that shows linkage.
Transcribed Image Text:In hyenas, long manes (a) are recessive to short manes (A) and having round ears (b) is recessive to having pointy ears (B). A hyena with a long mane that is homozygous for pointy ears is crossed with a hyena that has round ears and is homozygous for a short mane. The F1 progeny are then crossed with hyenas that have long manes and round ears (a testcross). PART A. If the loci for mane length and ear shape are on different chromosomes, what ratio would you expect from the testcross? PART B. Let's say instead that the genes for mane length and ear shape are located on the same chromosome, and findings from mapping experiments indicate that they are 16 m.u. apart. Assume 180 offspring are produced in testcrosses, what is the number of progeny expected for each phenotypic class? PART C. Is the F1 progeny in coupling or repulsion? Explain. Give the genotype of the F1 progeny of the parental cross, using notation that shows linkage.
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