In pea plants, yellow seeds are dominant to green. If a heterozygous yellow-seeded plant is crossed with a gre

Question

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow-seeded plant is crossed with a green-seeded plant, what ratio of yellow and green-seeded plants would you expect in F1 generation?

Accepted Answer

:
1.  Dominance: Yellow seed colour (Y) is dominant over green seed colour (y) .
2.  Genotypes: The heterozygous yellow plant has the genotype Yy. The green-seeded plant expresses the recessive trait, so its genotype must be homozygous recessive, yy .
3.  The Cross: This is a cross between a heterozygote and a homozygous recessive parent (), which is defined as a test cross .
4.  Ratio: A monohybrid test cross always yields a 1:1 ratio of dominant to recessive phenotypes. The offspring will be 50%  (Yellow) and 50%  (Green) .

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