Punnet Square I know a farmer who grew pumpkins for Halloween with really long s
ID: 91907 • Letter: P
Question
Punnet Square
I know a farmer who grew pumpkins for Halloween with really long stems (this is true-I know this farmer). His customers loved them since they could easily create an easy to manipulate cap for lighting and extinguishing the candle. He wanted to grow the really warty ones, but the warty ones have short stems. He figured he would cross pollinate the long stemmed pumpkins with the warty ones then plant the seeds from this crossing and see what he gets. To his surprise, he got about half with long stems and warty skin and half with long stems and smooth skin. Explain the reason for these phenotypes. Hint: Examine the two phenotypes separately then give your answer for both phenotypes.
Explanation / Answer
The long stems were homozygous dominant, and the short stems were homozygous recessive.
long stems ------homozygous dominant,------------genotypes = LL
long stems ------heterozygous dominant,------------genotypes = Ll
short stems were homozygous recessive. ,------------genotypes = ll
When they were crossed, we get heterozygous alleles, which form tall stems
long stems genotypes LL X short stems genotypes ll
L
L
l
Ll long stems
Ll long stems
l
Ll long stems
Ll long stems
long stems ------heterozygous dominant,------------genotypes = Ll
=======================================================
For the skin texture of the pumpkins, we crossed a heterozygous allele with a homozygous recessive leaving half with the dominant trait and half with the recessive
Warty skin----------- dominant trait--------------W allele
Smooth skin----------- recessive trait--------------w allele
Heterozygous dominant, ------------genotypes = Ww
heterozygous allele with a homozygous recessive
heterozygous genotypes = Ww x recessive genotypes ww
W
w
w
Warty skin Ww
Smooth skin ww
w
Warty skin Ww
Smooth skin ww
================================================================================================================================
Long & warty LIWw x Smooth& short llww
lw
LW
Long & warty LW lw
Lw
Lw lw Long & Smooth
lW
lw lW short & Smooth
lw
Smooth& short lw lw
L
L
l
Ll long stems
Ll long stems
l
Ll long stems
Ll long stems
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