Define the Following Terms and Provide One Example for Each

GENETICS DEFINE THE FOLLOWING TERMS AND PROVIDE ONE EXAMPLE FOR EACH. 1. Complete dominance:

2. incomplete dominance:

3. codominance:

MULTIPLE CHOICE 4. The appearance of an organism is its: A. Genotype B. phenotype C. molecular make-up D. popularity

5. A monohybrid cross of two individuals that are heterozygous for a trait would probably result in a phenotypic ratio of: A. 4:0 B. 1:3 C. 3:1 D. 1:1

6. To determine the genotype of an individual that shows the dominant phenotype, you would cross that individual with one that is: A. heterozygous dominant B. homozygous recessive C. homozygous dominant D. heterozygous recessive

7. An organism that is homozygous dominant for a flower color would have the genotype: A. RR B. Rr C. rr D. Red

8. In guinea pigs, black fur is dominant. A black guinea pig is crossed with a white guinea pig. If the litter contains a white offspring, the genotype of the black-haired parent is probably: A. homozygous dominant B. heterozygous C. homozygous recessive D. none of the above

9. If two parents with dominant phenotypes produce an offspring with a recessive phenotype, then probably: A. both parents are heterozygous B. one parent is heterozygous C. both parent are homozygous D. one parent is homozygous

10.Suppose you have found a new species of plant. Some of the plants have yellow flowers, and some have red flowers. You cross a red-flowering plant with a yellow-flowering plant. All of the offspring have orange flowers. Suggest a possible genotype for the offspring. A. FRFR B. FRFY C. FYFY D. FYFR MATCHING: Write the letter of the definition that best fits with the term.

______1. Homozygous A. an allele that can mask another allele

______2. Genotype B. diagram to predict traits of potential offspring

______3. Gene C. each of several alternative forms of a gene

______4. Phenotypic ratio D. genetic makeup of an organism

______5. Recessive E. both alleles in a gene pair, code for the same trait

______6. Heterozygous F. a short segment of DNA that codes for a trait

______7. Genotypic ratio G. number of time each phenotype appears in the offspring

______8. Phenotype H. cross between individuals that involves one pair of contrasting traits.

______9. Dominant I. physical appearance of an organism

______10. Punnett square J. two alleles in a gene pair, that don’t code for the same trait

______11. Allele K. number of times each genotype appears in the offspring

L. an allele that can by masked by another allele

FOR QUESTIONS 12 & 13 ASSUME THE FOLLOWING: Tall is dominant (T) to short (t).

12. If an organism is heterozygous, what is its genotype? Phenotype?

13. If an organism that is homozygous dominant mates with a recessive organism, give the genotypic & phenotypic ratios. SHOW ALL YOUR WORK.

14. If brown eyes are dominant to blue eyes, is it possible for 2 brown eyed people to produce a blue eyed child? JUSTIFY YOUR ANSWER.