MONOHYBRID CROSS WORKSHEET # 1 - Weebly



MONOHYBRID CROSS WORKSHEETS Combined Answer on your own notebook paper

For 1 – 5, the following problems, you need to write:

a. the cross formula that the problem is giving you (Aa x aa),

b. a completed Punnett square,

c. the complete genotype ratio with genotypes,

d. the complete phenotype ratio with phenotypes.

Problems 1 – 8 are complete dominance

1. For garter snake venom, acidic (A) is dominant to basic (a). If a heterozygous acidic venom garter snake is crossed with a homozygous acidic venom garter snake, determine the F1 genotypes and phenotypes.

2. In guinea pigs, black coat color (B) is dominant to white (b). If a homozygous black guinea pig is mated with a white guinea pig, what are the F1 genotypes and phenotypes?

3. In peas, green pods (G) is dominant to yellow (g). A pea plant that is homozygous for the green allele is crossed with a plant that produces homozygous yellow pods. Predict the ratios for the F1 genotype and phenotypes.

4. Two F1 plants from question 3 are crossed. Complete the problem to determine F2 genotypes and phenotypes.

5. For gazelles, divided hoofs (D) are dominant to undivided (d). Cross a heterozygous dominant parent with a recessive parent, and give genotypes and phenotypes of the F1 generation.

6. Define dominant, recessive, genotype, phenotype, heterozygous, homozygous

7. Oompas generally have blue faces, which is caused by a dominant gene. The recessive condition results in an orange face. List the possible genotypes and their associated phenotype.

8. A heterozygous blue faced Oompa is mated to another heterozygous. What proportion of their offspring will have orange faces?

Parent genotype equation –

Punnett Square –

Offspring genotypes and ratio –

Offspring phenotypes and ratio –

Proportion with orange faces –

9. Male parent Oompa is blue faced, and 3 of the 10 offspring Oompa’s have orange faces.

a. Explain how you know what the genotype of the male parent must be.

b. Explain how you know what the genotype of the female Oompa parent must be.

(multi – sentence explanations)

These 2 involve incomplete dominance.

10. In tomato plants, flat leaves (F) are dominant to tightly curled (f). In heterozygous plants, leaves are slightly curled. What are the F1 genotype and phenotype ratios for the cross of a homozygous dominant with a homozygous recessive?

11. Take two offspring from the F1 generation from problem 1, cross them to get an F2 generation, and give genotype and phenotype data.

Next 3 involve codominance.

In some types of cattle, when a red bull (RR) is mated with a white cow (WW), the offspring are a mixture of red and white called roan (RW) . For the following crosses, give the genotypes of the offspring and the ratios in which you would expect them to occur.

12. Cross a red bull with a roan cow.

13. Cross a white bull with a roan cow.

14. Yellow coat color in guinea pigs is produced by the genotype YY, cream color is due to the genotype YW and white color due the genotype WW. If two cream colored animals are crossed, give the genotypic and phenotypic ratios of the offspring.

Last 4 involve dominant/recessive, polygenic and/or multiple allele traits

Note the following color relationships in horses:

BAY BB or Bb or Br RED RR or Rr or Rb BUCKSKIN BR

White bb Gray rr Dapple br

15. A red male horse is bred to a dapple female, and the offspring is gray.

a. What are the genotypes of the parents?

b. What is the probability of offspring being gray?

c. What is the probability of offspring being red?

d. You have a herd of horses with bay, red, white and gray males. A red mare has given birth to a buckskin filly. What color is the sire?

16. A heterozygous Bay horse(Bb) is mated with a heterozygous Red(Rr) horse. What are the genotype and phenotype offspring probabilities?

17. In Snarlymonsters, the number of teeth is polygenic.  The recessive condition (aabbcc) results in a toothless Snarlymonster, and the dominant condition (AABBCC) results in a Snarlymonster with 6 teeth.  There are 5 other possible variations (This indicates incomplete dominance).

How many teeth would a AaBbCc Snarlymonster have? 

18. List the phenotypic ratios (how many teeth) of all the potential offspring for the cross AABBCc  x  AAbbcc .

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