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Genetics Review

Genetics Review. Honors Bio 2011. Which parents would you expect to give only one phenotype?. AaBb x aabb AaBb x AABB AaBb x AaBb AaBb x AAbb. Which parents would you expect to give a 9:3:3:1 ratio of phenotypes?. AaBb x aabb AaBb x AABB AaBb x AaBb AaBb x AAbb.

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Genetics Review

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  1. Genetics Review Honors Bio 2011

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

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

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

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

  6. Which of the following statements are true about sex-linked traits? • Since they are on the X chromosome, they are only expressed in females. • Since they are on the X chromosome, they are only expressed in males. • Are more likely to appear in the phenotypes of females. • Are more likely to appear in the phenotypes of males. • 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? • 10 • 12.5 • 20 • 25 • 30 • 40

  8. A B 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? • Homozygous • Dominant • Alleles • Recessive

  9. Based on this Punnett square, what percentage of offspring would be homozygous? • 25% • 50% • 75% • 100% B B B b

  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? • Codominance • Sex-linked genes • Autosomal recessive traits • 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? • 32 • 24 • 16 • 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? • XHXh • Xh Y • XH Y • XhXh

  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? • yyLl x YyLl • YyLl x YyLl • yyll x YYLL • 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? • 0% • 25% • 50% • 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? • 0% • 25% • 50% • 75% • 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? • 40 • 80 • 120 • 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? • Codominance • Dihybrid crosses • Inbreeding • Incomplete dominance

  18. Based on this Punnett square, what percentage of offspring would express the recessive trait? • 25% • 50% • 75% • 100% B b B b

  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? • 1/16 • 3/16 • 6/16 • 9/16 • 16/16

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