Question

genetics
valentines day color by number
directions choose the correct answer for each of the following questions. then color the picture on
the back based on the color that is paired with the correct answer for each question. fill in the
coloring key on the back above the picture so you dont have to keep flipping back and forth.

1. in incomplete dominance,

fspring show...
a. a blend (brown) b. one trait (white) c. both traits (purple) d. no trait (black)

1. which blood type is

dominant?
a. o (blue) b. a (pink) c. ab (red) d. b (green)

1. which genotype is

homozygous recessive?
a. bb (blue) b. bb (red) c. ab (pink) d. ab (brown)

1. which genotype is

homozygous dominant?
a. ab (pink) b. aa (yellow) c. aa (red) d. aa (light green)

1. cross aa x aa

what is the probability of a
recessive phenotype?
a. 0% (brown) b. 25% (dark green) c. 50% (white) d. 75% (blue)

1. cross aa x aa

what is the genotype of all
offspring?
a. aa (purple) b. aa (red) c. aa (yellow) d. mixed (pink)

1. cross aa x aa

what percent are
heterozygous?
a. 0% (white) b. 25% (pink) c. 50% (red) d. 100% (blue)

1. cross aa x aa

what percent show dominant
genotype?
a. 25% (red) b. 50% (black) c. 75% (pink) d. 100% (purple)

1. cross aa x aa

what is the genotype ratio?
a. 3:1 (yellow) b. 1:1 (red) c. 1:2:1 (brown) d. 9:3:3:1 (blue)

1. cross aa x aa

what percent show recessive
genotype?
a. 25% (green) b. 50% (purple) c. 75% (red) d. 100% (blue)

Explanation:

Step1: Incomplete dominance phenotype

In incomplete dominance, heterozygotes show a blend of the two parental traits.

Step2: Dominant blood type

Type O blood is recessive; types A, B are codominant, but if "dominant" refers to the most common or the one that masks recessive O, but AB is codominant. However, the standard dominant blood types are A and B, but the question asks which is dominant, and A is a dominant allele over O.

Step3: Homozygous recessive genotype

Homozygous recessive means two identical recessive alleles, represented as lowercase letters (bb).

Step4: Homozygous dominant genotype

Homozygous dominant means two identical dominant alleles, represented as uppercase letters (AA).

Step5: Probability of recessive phenotype (Aa x Aa)

Cross Aa x Aa yields genotypes AA, Aa, Aa, aa. Recessive phenotype is aa, which is 1 out of 4, so 25%.

Step6: Genotype of AA x aa offspring

AA can only pass A, aa can only pass a. All offspring are Aa.

Step7: Heterozygous percentage (Aa x aa)

Cross Aa x aa yields Aa, Aa, aa, aa. Heterozygotes (Aa) are 2 out of 4, so 50%.

Step8: Dominant phenotype percentage (AA x Aa)

Cross AA x Aa yields AA, AA, Aa, Aa. All offspring have at least one dominant A allele, so 100% show dominant phenotype.

Step9: Genotype ratio (Aa x Aa)

Cross Aa x Aa yields 1 AA : 2 Aa : 1 aa, so the ratio is 1:2:1.

Step10: Recessive phenotype percentage (Aa x aa)

Cross Aa x aa yields Aa, Aa, aa, aa. Recessive phenotype (aa) is 2 out of 4, so 50%.

Answer:

1. a. A blend (brown)
2. b. A (pink)
3. b. bb (red)
4. d. AA (light green)
5. b. 25% (dark green)
6. a. Aa (purple)
7. c. 50% (red)
8. d. 100% (purple)
9. c. 1:2:1 (brown)
10. b. 50% (purple)