Question

Consider, pea plants, for which green color is dominant to yellow color, and two leaves are dominant to three. A cross between two plants that are heterozygous green and heterozygous tall is completed. What is the phenotypic ratio? 1:1:1:1

9:3.3:1
1:3:3:9
9:1:3:3​

Answer 1

The phenotypic ratio is 9:3:3:1

Step-by-step explanation:

Available data:

• green color (G-) is dominant to yellow color (gg)
• G allele is dominant. g allele is recessive
• two leaves (T-) are dominant to three (tt)
• T allele is dominant, t allele is recessive

Cross: between two plants that are heterozygous green and heterozygous tall

Parentals) GgTt x GgTt

Phenotype) Green color Green color

Two petals Two petals

Gametes) GT, Gt, gT, gt GT, Gt, gT, gt

Punnett Square) GT Gt gT gt

GT GGTT GGTt GgTT GgTt

Gt GGTt GGtt GgTT Ggtt

gT GgTT GgTt ggTT ggTt

gt GgTt Ggtt ggTt ggtt

F1) Genotype:

1/16 GGTT

2/16 GGTt

1/16 GGtt

2/16 GgTT

4/16 GgTt

2/16 Ggtt

1/16 ggTT

2/16 ggTt

1/16 ggtt

Phenotype:

9/16 G-T- --> Green-colored and two-leaved plant

3/16 G-tt ----> Green-colores and three-leaved plant

3/16 ggT---> Yelow-colores and two-leaved plant

1/16 ggtt ---> Yeloow-colores and three-leaved plant