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Genetics Review Time!

Genetics Review Time!. February 4, 2011. 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.

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Genetics Review Time!

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  1. Genetics Review Time! February 4, 2011

  2. 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

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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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%

  9. 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%

  10. 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

  11. 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

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

  13. 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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