A long, striped watermelon is crossed with a another long, striped watermelon. List below all the...
A long, striped watermelon is crossed with a another long, striped watermelon. List below all the possible phenotypes and genotypes of the progeny.
THIS IS ALL THE INFORMATION I HAVE! :(
2. In watermelons, the color green is due to a dominant allele. Two green watermelons are crossed and produce 286 green watermelons and 91 striped watermelons. Give the genotype of the parents.
3. Watermelons also have a dominant allele for short shape. If a short watermelon is crossed with a long watermelon and all of the progeny have a short shape, what are the genotypes of the parents?
4. A long, striped watermelon is crossed with a another long, striped watermelon. List below all the possible phenotypes and genotypes of the progeny.
5. If two watermelons are crossed and the progeny are as follows: 91 green and short, 29 green and long, 31 striped and short, and 11 striped and long.
What are the genotypes of the two parents?
Homework Answers
Solid green colour (GG, Gg) is dominant over stripped (gg) appearance in watermelons.
Short shape (SS, Ss) is dominant over long shape (ss).
2. All the progenies we get is green and stripped both. So parents must be heterozygous green, Gg.
Gg × Gg = GG (green), Gg (green), gg (stripped)
3. All progenies are short. So, the parents must have homozygous genotype for short shape, SS.
So, SS × ss = Ss (all short)
4. Both long and stripped are recessive.
So, ssgg × ssgg = ssgg (long, stripped progenies)
5. If you carefully look at the phenotypes of the progeny, then you will see four types of phenotypes,
Both traits dominant (green, short)
Only one trait dominant (green, long and stripped, short)
Both traits recessive (stripped, long)
These 4 traits are possible only when 2 parents, both being heterozygous for both the traits cross.
SsGg × SsGg (parents)
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