The results can also be evaluated under the assumption
that some suri animals are homozygous for the dominant
allele. Nothing in the literature suggests subvitality
of homozygous animals, and homozygous animals in the
population would satisfactorily account for the relative
underproduction of huacaya offspring from suri×suri matings
if all suris are heterozygous. Under the hypothesis of
a single gene, the frequency of the recessive huacaya allele
in this population of suris is about 0.37, or nearly 0.4, and
the frequency of the dominant suri allele is 0.63, or about
0.6. If the huacaya×suri matings are corrected by using
these gene frequencies, the result is an even higher chi
square than under the assumption that all suri parents are
heterozygous (chi square = 93.5, p < 0.01), because the overproduction
of huacaya offspring is all the more marked, and
the hypothesis of a single dominant gene becomes much
less likely to be true.
These results reveal complexity in the inheritance of
suri fleece beyond a single-gene hypothesis. The suri×suri
matings are consistent with suri being a genetically dominant
trait, with the recessive huacaya type segregating
from it fairly frequently. The relative excess of suri offspring
in these crosses is consistent with the population
including homozygous animals, although the relative frequency
of huacaya offspring does indicate that many suri
parents are indeed heterozygous rather than homozygous
The results can also be evaluated under the assumption
that some suri animals are homozygous for the dominant
allele. Nothing in the literature suggests subvitality
of homozygous animals, and homozygous animals in the
population would satisfactorily account for the relative
underproduction of huacaya offspring from suri×suri matings
if all suris are heterozygous. Under the hypothesis of
a single gene, the frequency of the recessive huacaya allele
in this population of suris is about 0.37, or nearly 0.4, and
the frequency of the dominant suri allele is 0.63, or about
0.6. If the huacaya×suri matings are corrected by using
these gene frequencies, the result is an even higher chi
square than under the assumption that all suri parents are
heterozygous (chi square = 93.5, p < 0.01), because the overproduction
of huacaya offspring is all the more marked, and
the hypothesis of a single dominant gene becomes much
less likely to be true.
These results reveal complexity in the inheritance of
suri fleece beyond a single-gene hypothesis. The suri×suri
matings are consistent with suri being a genetically dominant
trait, with the recessive huacaya type segregating
from it fairly frequently. The relative excess of suri offspring
in these crosses is consistent with the population
including homozygous animals, although the relative frequency
of huacaya offspring does indicate that many suri
parents are indeed heterozygous rather than homozygous
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