In 1983, a sheep farmer in Oklahoma noticed in his flock a ram that possessed increased muscle mass in his hindquarters. Many of the offspring of this ram possessed the same trait, which became known as the callipyge phenotype (callipyge is Greek for “beautiful buttocks”). The mutation that caused the callipyge phenotype was eventually mapped to a position on the sheep chromosome 18. When the male callipyge offspring of the original mutant ram were crossed with normal females, they produced the following progeny: 14 male callipyge, 14 female callipyge, 14 male normal, and 14 female normal. When the female callipyge offspring of the original mutant ram were crossed with normal males, all of the offspring were normal. Analysis of the chromosomes of these offspring of callipyge females showed that half of them received a chromosome 18 with the allele encoding callipyge from their mother. Propose an explanation for the inheritance of the allele for callipyge. How might you test your explanation?
In 1983, a sheep farmer in Oklahoma noticed in his flock a ram that
possessed increased muscle mass in his hindquarters. Many of the
offspring of this ram possessed the same trait, which became known as
the callipyge
The mutation that caused the callipyge phenotype was eventually
mapped to a position on the sheep chromosome 18.
When the male callipyge offspring of the original mutant ram were
crossed with normal females, they produced the following progeny: 14
male callipyge, 14 female callipyge, 14 male normal, and 14 female
normal. When the female callipyge offspring of the original mutant ram
were crossed with normal males, all of the offspring were normal.
Analysis of the chromosomes of these offspring of callipyge females
showed that half of them received a chromosome 18 with the allele
encoding callipyge from their mother. Propose an explanation for the
inheritance of the allele for callipyge. How might you test your
explanation?
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