Name:___________________________ Period: 1 2 3 4 5 6 7 Date:___________________
Gene
Symbols
Select the correct gene symbols for the following traits that organisms have.
1. MICE
a. Black fur is dominant over white fur.
Black_____
White_____
2. PEA PLANTS
a. Red color of flower is dominant over white flowers.
Red_____
White_____
b. Tall plants are dominant over dwarf plants.
Tall_____
Dwarf_____
c. Smooth seed pods are dominant over wrinkled seed pods.
Smooth_____
Wrinkled_____
3. TIGERS
a. Orange fur is dominant over white fur.
Orange_____
White_____
4. HUMANS
a. Curly hair is dominant over straight hair.
Curly_____
Straight_____
b. Freckles dominate over no freckles.
Freckles_____
No Freckles_____
c. Right handedness dominates left handedness.
Right_____
Left_____
Write the symbols (genotypes) for the following genetic combinations.
Purebred Black Mouse_____
White Tiger_____
Purebred Freckles_____
Purebred White Mouse_____
Left Handed_____
Hybrid Curly Haired_____
Hybrid Red Pea Plant_____
No Freckles_____
Hybrid Smooth Pod Plant___
Purebred White Pea Plant_____
Purebred Right Handed_____ Straight Haired Boy_____
Hybrid Tall Pea Plant_____
Purebred Dwarf Pea Plant_____
Purebred Smooth Pod Pea Plant____ Purebred Orange Tiger______
Hybrid Orange Tiger_____
Hybrid Right Handed_____
Hybrid Freckles_____
Purebred Curly Haired Girl_____
Hybrid Black Mouse_____
1. When selecting a gene symbol why do you choose the letter you do to represent the
dominant and recessive alleles?
2. What makes a gene dominant when compared with a recessive gene?
Punnett Squares
Fill out the Punnett square and place the ratio and percent of each genotype on the line.
1. KK x Kk
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
4. BB x YY
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
7. BB x BY
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
2. Tt x Tt
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
5. BY x BY
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
8. Ww x WW
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
3. SS x Ss
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
6. Rr x rr
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______
9. rr x rr
Purebred Dominant_______
Hybrid_______
Purebred Recessive_______