11 Jun Simon BIOLOGY 102 – In 2006, a nineteen-year-old
Question
In 2006, a nineteen-year-old female Colombian rainbow boa, Epicrates maurus,
who had been raised alone since she was born, gave birth to a litter of 11
parthenogenetic offspring. Seven of the baby snakes were healthy, two were
deformed and were euthanized, and two were stillborn.
The genotype of the living baby snakes was determined at four genes for which
the mother snake was heterozygous. Each baby was found to be homozygous at
all four genes, but the babies were homozygous for different alleles. At each gene,
some babies were homozygous for one of their mother’s alleles, while other
babies were homozygous for the other of their mother’s alleles.
a. Clearly explain how the normal events of meiosis may have been modified to
produce the parthenogenetic babies in the female Colombian rainbow boa.
b. Explain why the baby snakes were homozygous at the four genes, although
their mother was heterozygous.
c. Explain why the baby snakes were genetically different from each other, i.e.,
were not homozygous for the same allele at each gene.
d. If the researchers investigated the baby snakes’ genotype at two additional
genes for which the mother snake was heterozygous and found that two of the
babies were heterozygous (i.e., one baby was heterozygous for each of the
additional genes), would you have to modify your answer to part (a)? Explain
your answer.
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