Biology //Pedigree Worksheet
Name _________________________ Pd ____
1. The following passage goes along with the pedigree pictured below. Write the name of each person below
the correct symbol.
Although Jane and Joe Smith have dimples, their daughter Clarissa does not. Joe’s dad has dimples, but his
mother, and sister Grace do not. Jane’s Dad, Mr. Renaldo, her brother George, and her sister Emily do not
have dimples but her mother does.
2. How are marriages and offspring symbolized in pedigrees?
3. What do the roman numerals symbolize?
4. Is dimple inheritance dominant or recessive?
5. Make a pedigree based on this passage about freckle inheritance.
Andy, Penny, and Dilbert have freckles, but their parents, Mr. and Mrs. Miller, do not. Mrs. Potter, Mrs.
Miller’s sister, has freckles, but her parents Mr. and Mrs. Reed do not. Becky and Janet Potter are freckled,
but their sister, Diane, like her father, is not freckled.
6. Would you say that the freckle trait is dominant or recessive? (circle correct answer)
7. Partially shade in the boxes or circles of the people heterozygous for the trait.
8. What advantages does a pedigree have over a written passage?
9. The following pedigree shows four generations of colorblindness (a sex-linked trait). Complete the pedigree
by partially shading in the carriers of the colorblind allele.
10. Can males be carriers of the colorblind allele?
11. Label all of the genotypes in the pedigree above.
12. Make a pedigree based on this passage about colorblindness.
Ma & Pa Hatfield had 4 kids. Jerry the oldest was colorblind. His younger sister, Ethel was not. Bertha was
next (not colorblind) but Bubba, the baby was. Bubba married Boopsie (not colorblind) and had colorblind
twins, Buddy Joe & Bobby Lee. Jerry married lifelong sweetie, Gertrude and had 6 kids- 3 girls (Sally, Suzie, &
SaraLee) and 3 boys (Jimmy, Jesse, & Jeremiah). SaraLee and Jeremiah were colorblind. The others were not.