Question

1 for each phenotype below, list the genotypes
a. straight hair is dominant to curly.

• ____ straight
• ____ straight
• ____ curly

b. pointed heads are dominant to round heads.

• ____ pointed
• ____ pointed
• ____ round

table 1: mendels traits and symbols for pea plants

traits	dominant allele	symbol	recessive allele	symbol
seed color	yellow	y	green	y
seed coat color	colored	c	white	c
pod shape	smooth	s	constricted	s
pod color	green	g	yellow	g
stem height	tall	t	short	t
flower position	axial	a	terminal	a

phenotype | genotype |

1. heterozygous for height	____
2. homozygous dominant for seed shape	____
3. heterozygous colored seed coat	____
4. homozygous green pod	____
5. homozygous short	____
6. homozygous tall	____
7. homozygous axial	____
8. homozygous terminal	____
9. heterozygous flower position	____
10. heterozygous seed color	____
11. homozygous smooth pod	____
12. homozygous constricted pod	____
13. homozygous recessive for seed coat color	____
14. heterozygous for pod color	____
15. homozygous round seed	____

Explanation:

Step1: Recall Genotype Rules

Heterozygous: One dominant, one recessive allele (e.g., Tt). Homozygous dominant: Two dominant alleles (e.g., TT). Homozygous recessive: Two recessive alleles (e.g., tt). Use Table 1 symbols.

Step2: Solve Each Phenotype

1. Heterozygous for height: Height trait has dominant T (tall), recessive t (short). Heterozygous: \( Tt \)
2. Homozygous dominant for seed shape: Seed shape dominant R (round). Homozygous dominant: \( RR \)
3. Heterozygous colored seed coat: Seed coat color dominant C (colored), recessive c (white). Heterozygous: \( Cc \)
4. Homozygous green pod: Pod color dominant G (green), recessive g (yellow). Homozygous dominant (green is dominant): \( GG \)
5. Homozygous short: Height recessive t (short). Homozygous recessive: \( tt \)
6. Homozygous tall: Height dominant T (tall). Homozygous dominant: \( TT \)
7. Homozygous axial: Flower position dominant A (axial), recessive a (terminal). Homozygous dominant: \( AA \)
8. Homozygous terminal: Flower position recessive a (terminal). Homozygous recessive: \( aa \)
9. Heterozygous flower position: Flower position dominant A, recessive a. Heterozygous: \( Aa \)
10. Heterozygous seed color: Seed color dominant Y (yellow), recessive y (green). Heterozygous: \( Yy \)
11. Homozygous smooth pod: Pod shape dominant S (smooth), recessive s (constricted). Homozygous dominant: \( SS \)
12. Homozygous constricted pod: Pod shape recessive s (constricted). Homozygous recessive: \( ss \)
13. Homozygous recessive for seed coat color: Seed coat color recessive c (white). Homozygous recessive: \( cc \)
14. Heterozygous for pod color: Pod color dominant G, recessive g. Heterozygous: \( Gg \)
15. Homozygous round seed: Seed shape dominant R (round). Homozygous dominant: \( RR \)

Answer:

1. \( Tt \)
2. \( RR \)
3. \( Cc \)
4. \( GG \)
5. \( tt \)
6. \( TT \)
7. \( AA \)
8. \( aa \)
9. \( Aa \)
10. \( Yy \)
11. \( SS \)
12. \( ss \)
13. \( cc \)
14. \( Gg \)
15. \( RR \)