1. Jeopardy by
Ms. Lenz

2. Math
Genetic Cross
Alleles
Data Sets
100
200
300
400
500

3. Genetic Cross
Math
Alleles
Data Sets
100
100
100
100
200
200
200
200
300
300
300
300
400
400
400
400
500
500
500
500

4. 2x2x1x1x2x2 = 16
How many genetically unique sperm can a man with the following genotype make: AaBbCCDDEeFf?
Row 1, Col 1

5. Justify each selection with a Punnett square.
1. Aa x aa Aa x Aa
Using the alleles A and a, give the genotypes of the parents that would result in the following phenotype ratios:
1:1
3:1
Justify each selection with a Punnett square.
1,2

6. Mutation
Alleles are different versions of a gene, that code for a specific protein, that produces a specific trait such as flower-color. New alleles, such as a brand new flower color arise as a result of:
1,3

7. Tall is dominant all F1 plants in cross 1 have this phenotype.
A student performs two crosses between
two different short and tall plants.
The results are as follows:
Cross 1: 989 tall and 0 short
Cross 2: 492 tall and 502 short
What is the dominant phenotype?
Provide justification tied back to the data:
1,4

8. Sickle-cell anemia is an inherited disease caused by an autosomal recessive allele. In a cross between two carrier parents, in which the first child does not have the disease, what is the probability that next child will?
2,1

9. 100% offspring would be recessive for both traits
What would be the phenotype-outcome for the following cross aabb x aabb?
2,2

10. 1 letter difference in the DNA (A vs. T) for the gene
There are two alleles for beta-globin. Wild-type and the sickle-cell allele. At the DNA level, what is the difference between these two alleles?
2,3

11. A student performs two crosses between
Cross 1: 1:0, Cross 2: 1:1
A student performs two crosses between
two different short and tall plants.
The results are as follows:
Cross 1: 989 tall and 0 short
Cross 2: 492 tall and 502 short
What is the phenotype ratio for each cross?
2,4

12. ¼ x ¼ = 1/16
Sickle-cell anemia is an inherited disease caused by an autosomal recessive allele. In a cross between two carrier parents, what is the probability that they will have two children with the disease?
3,1

13. 9:3:3:1
What would be the expected phenotype ratio for the following cross: AaBb x AaBb?
3,2

14. Having one-copy of the allele (carrier-status) offers protection against malaria, increasing survival.
Multiple alleles represent genetic variation that natural selection can act on. Why was the sickle-cell allele maintained in the human population inhabiting equatorial Africa?
3,3

15. Cross 1: TT x tt Cross 2: Tt x tt
A student performs two crosses between
two different short and tall plants.
The results are as follows:
Cross 1: 989 tall and 0 short
Cross 2: 492 tall and 502 short
What are the genotypes of the parents for each cross? Show Punnett squares as justification for your selections.
3,4

16. ¾ x ¾ = 9/16
Sickle-cell anemia is an inherited disease caused by an autosomal recessive allele. In a cross between two carrier parents, what is the probability that they will have two children that are phenotypically normal?
4,1

17. XNXn mother and XnY father: 50% sons & daughters
Color-blindness is a recessive, sex-linked trait.
Give the genotypes of the parents in a cross between a female with normal vision, whose father was color-blind and a man with color-blindness
Give the % of sons and daughters that would be color-blind
Justify with a punnett square
4,2

18. Mutant hemoglobin clumps together into long rods, tweaking the shape of red-blood cells
Individuals that have the genetic disorder called sickle-cell anemia have red blood cells that become sickle-shaped. Explain what causes the cells to become sickle-shaped:
4,3

19. A student performs two crosses between
Tt x Tt = 3:1
A student performs two crosses between
two different short and tall plants.
The results are as follows:
Cross 1: 989 tall and 0 short
Cross 2: 492 tall and 502 short
If two of the tall offspring resulting from
Cross #2 were crossed, would be the
Resulting phenotype ratio? Show a Punnett square as justification for your selection:
4,4

20. ½ x ½ x ½ x 1 = 1/8 or 0.125
A certain species of plant, with four genes: A, B, C, and D has one dominant and one recessive allele for each gene. For a plant with the genotype AaBbCcDD, what is the probability of producing a gamete with the haploid genotye of ABCD. Give your answer as a fraction or as a value between 0 and 1 rounded to 4 decimal places.
5,1

21. Freckles (F) and PTC-tasting (T) are
1:1:1:1
Freckles (F) and PTC-tasting (T) are
dominant phenotypes in humans. What
would be the expected phenotype ratio
from the following cross: Show a Punnett square as justification for your selection.
FfTt x fftt?
5,2

22. Autosomal, recessive, aa
Autosomal or sex-linked
Dominant or recessive?
Genotype of individual #7
5,3

23. Purple & inflated, PPII x ppii, PpIi, 1:1:1:1
In a genetic cross between true-breeding purple inflated, and true-breeding white constricted plants, all F1 are purple and inflated.
What are the dominant phenotypes?
Give the genotypes of the parental generation:
Give the genotypes of the F1 generation.
What is the expected phenotype ratio for a cross between a F1 generation plant and a plant that is homozygous recessive for both traits?
5,4