Question

1. tall sunflowers are dominant to short, while yellow-colored flowers are dominant to orange. cross a plant that is heterozygous for both traits with a plant that is heterozygous for height, but homozygous dominant for flower color. what will be the possible genotypes and phenotypes of the offspring? show your work as a punnett square and write your answers as a phenotypic ratio.

1. using the punnett square that you created for problem #7, answer the following

Explanation:

Step1: Define allele symbols

Let \(T\) = tall (dominant), \(t\) = short (recessive); \(Y\) = yellow (dominant), \(y\) = orange (recessive)

Step2: Identify parent genotypes

Parent 1 (heterozygous for both): \(TtYy\), gametes: \(TY, Ty, tY, ty\)
Parent 2 (heterozygous height, homozygous dominant color): \(TtYY\), gametes: \(TY, TY, tY, tY\)

Step3: Build Punnett square

	\(TY\)	\(Ty\)	\(tY\)	\(ty\)
\(TY\)	\(TTYY\)	\(TTYy\)	\(TtYY\)	\(TtYy\)
\(tY\)	\(TtYY\)	\(TtYy\)	\(ttYY\)	\(ttYy\)
\(tY\)	\(TtYY\)	\(TtYy\)	\(ttYY\)	\(ttYy\)

Step4: Classify phenotypes

• Tall, yellow: \(TTYY, TTYy, TtYY, TtYy\) (12 total)
• Short, yellow: \(ttYY, ttYy\) (4 total)

Step5: Calculate phenotypic ratio

Simplify \(12:4\) to \(3:1\)

Answer:

Possible Genotypes:

\(TTYY\), \(TTYy\), \(TtYY\), \(TtYy\), \(ttYY\), \(ttYy\)

Phenotypic Ratio:

3 tall, yellow sunflowers : 1 short, yellow sunflower