Question

1. a tall, green pea plant (ttgg) is crossed with a short, white pea plant (ttgg). 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.

Explanation:

Step1: Identify gamete combinations

Parent 1 (TtGg) produces: $TG, Tg, tG, tg$
Parent 2 (ttgg) produces: $tg$

Step2: Verify Punnett square entries

Match each gamete pair:

• $TG + tg = TtGg$
• $Tg + tg = Ttgg$
• $tG + tg = ttGg$
• $tg + tg = ttgg$

Each genotype appears 4 times in the 16-square grid.

Step3: Assign phenotypes

• $TtGg$: Tall, Green (T=dominant tall, G=dominant green)
• $Ttgg$: Tall, White (gg=recessive white)
• $ttGg$: Short, Green (tt=recessive short)
• $ttgg$: Short, White

Step4: Calculate phenotypic ratio

Count each phenotype: 4 Tall Green, 4 Tall White, 4 Short Green, 4 Short White. Simplify the ratio.

Answer:

Possible Genotypes:

$TtGg$, $Ttgg$, $ttGg$, $ttGg$, $ttgg$ (each occurring at a 1:1:1:1 genotypic ratio)

Phenotypes and Phenotypic Ratio:

Tall, Green : Tall, White : Short, Green : Short, White = 1:1:1:1