University:
University of Cincinnati
Course:
BIOL 1081 | Biology I
Academic year:

2023
Views:

335

Pages:

3
Author:

Asia Johns

Probability and Punnett Squares Quiz Lesson Goal: To learn about probability & Punnett squares. 1. The likelihood that a particular event will occur is called ___ Answer: Probability 2. a) b) c) d) Which letter represents the probability that a single coin flip will come up heads. 100 percent 75 percent 50 percent 25 percent Answer: C) 50 percent 3. Is the following sentence true or false? The past outcomes of coin flips greatly affect the outcomes of future coin flips. Answer: False 4. Why can the principles of probability be used to predict the outcomes of genetic crosses? Answer: The way in which the alleles segregate is completely random, like a coin flip. 5. How do geneticists use Punnett squares? Answer: Punnett squares can be used to predict and compare the genetic variations that will result from a cross. 6. a) b) c) d) Allele Types: Homo - ? Hetero - ? Pheno - ? Geno - ? Answer: a) Same, b) Other/Opposite, c) Physical, d) Genetic Definitions 7. Organisms that have two identical alleles particular trait (TT or tt) Answer: Homozygous 8. Organisms that have two different alleles -same trait (Tt) Answer: Heterozygous 9. Heterozygous or Homozygous? a) Tt – b) c) d) e) f) BB – bb – TT – tt – Bb – Answer: a) Heterozygous (Hybrid), b) Homozygous Dominant, c) Homozygous Recessive, d) Homozygous Dominant, e) Homozygous Recessive, f) Heterozygous (Hybrid) 10. These are the classic Mendelian crosses! a) TT × tt – b) Tt × Tt – c) TT × Tt – d) Tt× tt – Answer: a) homozygous dominant × homozygous recessive, b) both parents are heterozygous, c) homozygous dominant × heterozygous, d) heterozygous × homozygous recessive 11. Physical characteristic of an organism - ? Answer: Phenotype 12. Genetic makeup of an organism (Tt) - ? Answer: Genotype 13. Are the following sentences true or false? Homozygous organisms are true breeding for a particular trait. Answer: True 14. Are the following sentences true or false? Plants with the same phenotype always have the same genotype. Answer: False Segregation and ratios The F2 ratio of tall plants to short plants produced in a cross between two hybrid tall pea plants (Tt) is 3 tall plants for every 1 short plant. Mendel observed that about 3⁄4 of the F2 offspring showed the dominant trait. Segregation occurs according to Mendel’s model. 1. In Mendel’s model of segregation, what was the ratio of tall plants to short plants in the F2 generation? Answer: The ratio was 3 : 1. 2. Is the following sentence true or false? Probabilities predict the precise outcome of an individual event. Answer: False 3. How can you be sure of getting the expected 50 : 50 ratio from flipping a coin? Answer: You must flip the coin many times. 4. Is the following sentence true or false? The ratios of an F1 generation are more likely to match Mendelian predicted ratios if the F1 generation contains hundreds or thousands of individuals. Answer: True