1. Genetics Review Honors Bio 2011

2. Which parents would you expect to give only one phenotype? 1.AaBb x aabb 2.AaBb x AABB 3.AaBb x AaBb 4.AaBb x AAbb

3. Which parents would you expect to give a 9:3:3:1 ratio of phenotypes? 1.AaBb x aabb 2.AaBb x AABB 3.AaBb x AaBb 4.AaBb x AAbb

4. Which parents would you expect to give a 1:1:1:1 ratio of phenotypes? 1.AaBb x aabb 2.AaBb x AABB 3.AaBb x AaBb 4.AaBb x AAbb

5. Which parents would you expect to give only two phenotypes (50 % each)? 1.AaBb x aabb 2.AaBb x AABB 3.AaBb x AaBb 4.AaBb x AAbb

6. Which of the following statements are true about sex-linked traits? 1.Since they are on the X chromosome, they are only expressed in females. 2.Since they are on the X chromosome, they are only expressed in males. 3.Are more likely to appear in the phenotypes of females. 4.Are more likely to appear in the phenotypes of males. 5.More than one answer is correct

7. In garden peas, yellow seed color is dominant over green. A cross between a homozygous yellow plant and a homozygous green plant yields 25 plants. If an F1 cross were performed and 40 plants were produced, how many of the F2 plants would you expect to be yellow? 1.10 2.12.5 3.20 4.25 5.30 6.40

8. Regions marked A and B are genes. “A” results in the production of purple flowers. “B” results in the production of white flowers. Which term best describes these different flower color genes? A B 1.Homozygous 2.Dominant 3.Alleles 4.Recessive

9. Based on this Punnett square, what percentage of offspring would be homozygous? BB B b 1.25% 2.50% 3.75% 4.100%

10. Cattle have red, roan, & white coat colors. When a red bull and white cow mate, a roan color, which is a “mixture” of red & white, is produced. What is this an example of? 1.Codominance 2.Sex-linked genes 3.Autosomal recessive traits 4.Pedigrees

11. A cross is made between two parents with the genotypes AaBB and aabb. If there are 32 offspring, how many of them would be expected to be heterozygous for both characteristics? 1.32 2.24 3.16 4.8

12. Below is a pedigree showing red-green color-blindness, a recessive sex-linked trait in a family. What is the genotype of the individual indicated by the arrow? 1.X H X h 2.X h Y 3.X H Y 4.X h X h

13. In toucans, yellow beak color (Y) is dominant over green beak color and long feathers (L) are dominant over short. A male toucan with a green beak and long feathers mates with a female with a yellow beak and long feathers. They have offspring with green beaks and short feathers. What are the genotypes of the parents? 1.yyLl x YyLl 2.YyLl x YyLl 3.yyll x YYLL 4.Yyll x yyLL

14. If the person that is the arrow is pointing to marries a female who is homozygous dominant, what is the possibility that they will have a daughter that carries the red-green colorblindness gene? 1.0% 2.25% 3.50% 4.100%

15. A man with a blood type A marries a woman with blood type B. Their first child has type O blood. What is the possibility that they could have another child with blood type O? 1.0% 2.25% 3.50% 4.75% 5.100%

16. In roses, red color is dominant over yellow color. A cross between a homozygous red rose and a homozygous yellow rose yields 80 heterozygous roses. A cross between two of these heterozygous roses yields 160 F2 roses. How many of these F2 roses are expected to be red? 1.40 2.80 3.120 4.160

17. When a blue sea sponge mates with yellow sea sponge, a beautiful shade of green sea sponge is produced. What is this an example of? 1.Codominance 2.Dihybrid crosses 3.Inbreeding 4.Incomplete dominance

18. Based on this Punnett square, what percentage of offspring would express the recessive trait? Bb B b 1.25% 2.50% 3.75% 4.100%

19. In spiders eight legs is due to a dominant allele (E). Hairy bodies on spiders are due to another dominant allele (H). If a male who has both conditions (EeHh) mates with a female with both (EeHh), what are the chances of an offspring having only one of the two dominant traits? 1.1/16 2.3/16 3.6/16 4.9/16 5.16/16