Two male mice, which we will call male A and male B, are bothphenotypically normal. Male A was from a litter that containedhalf phenotypically normal mice and half dwarf mice. The motherof male A was known to be homozygous for the normal Igf2 allele.Male B was from a litter of eight mice that were all phenotypicallynormal. The parents of male B were a phenotypically normal maleand a dwarf female. Male A and male B were put into a cage withtwo female mice that we will call female A and female B. FemaleA is dwarf, and female B is phenotypically normal. The parents ofthese two females were unknown, although it was known that theywere from the same litter. The mice were allowed to mate witheach other, and the following data were obtained:Female A gave birth to three dwarf babies and four normal babies.Female B gave birth to four normal babies and two dwarf babies.Which male(s) mated with female A and female B? Explain.
Two male mice, which we will call male A and male B, are both
half phenotypically normal mice and half dwarf mice. The mother
of male A was known to be homozygous for the normal Igf2 allele.
Male B was from a litter of eight mice that were all phenotypically
normal. The parents of male B were a phenotypically normal male
and a dwarf female. Male A and male B were put into a cage with
two female mice that we will call female A and female B. Female
A is dwarf, and female B is phenotypically normal. The parents of
these two females were unknown, although it was known that they
were from the same litter. The mice were allowed to mate with
each other, and the following data were obtained:
Female A gave birth to three dwarf babies and four normal babies.
Female B gave birth to four normal babies and two dwarf babies.
Which male(s) mated with female A and female B? Explain.
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