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Principles of Biology I Exam 4 Review Questions

1. What is the difference between a genotype and a phenotype? 2. Write the genotype of a homozygous recessive, homozygous dominant, and heterozygous pea plant using the trait flower color (p). 3. Different versions of a gene are called ____________.

4. Why are there always two alleles present for each gene at a specific locus? 5. True or False. A dominant allele is always written with a capital letter, whereas the recessive allele is always written in lower-case. 6. True or False. In a sperm or egg, both of the two alleles on the homologous chromosomes are passed on to offspring. 7. When genes are present on the same chromosome, they are inherited separately/ together (circle correct choice). 8. When genes are present on different chromosomes, they are inherited separately/ together (circle correct choice). 9. The name of the process described in #7 is called ____________. 10. The name of the process described in #8 is called ____________. 11. The only way that a recessive trait is ever seen in the phenotype is if the genotype is: homozygous dominant/ heterozygous/ homozygous recessive (circle correct choice). 12. What is the purpose of doing a Punnett square?

13. Do a monohybrid cross between a homozygous recessive pea plant and a heterozygous pea plant, using the trait for flower color (p). List the genotypes and phenotypes of the offspring (in %). 14. What do the designations P, F1, and F2 mean?

15. If a plant with white flowers mates with a plant with red flowers, and some of their offspring have pink flowers, then this is probably due to a kind of inheritance called _________________. 16. True or False. Each physical or chemical characteristic that organism show is due to the action of a single gene. 17. What is the difference between a monohybrid and a dihybrid cross? 18. How would you label the 4 columns and the 4 rows on a dihybrid Punnett square when a female cat...
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