1. Offspring that result from crosses between parents with different traits

1. 1. Offspring that result from crosses between parents with different traits A) make up the parental generation B) are true-breeding C) are called hybrids D) make up the F2 generation

2. 2. The chemical factors that determine traits are called A) alleles B) genes C) characters D) traits

3. 3. Gregor Mendel removed the male parts from the flowers of some plants in order to A) make controlled crosses between plants B) stimulate self-pollination C) prevent hybrids from forming D) prevent cross-pollination

4. 4. In the P generation, a tall plant was crossed with a short plant. If alleles did not segregate during gamete formation A) all of the F2 plants would be short B) some of the F1 plants would be tall and some would be short C) all of the F2 plants would be tall D) all of the F1 plants would be short

5. 5. A heterozygous tall pea plant is crossed with a short plant. The probability that an F1 plant will be tall is A) 25% B) 100% C) 75% D) 50%

6. 6. A Punnett square shows all of the following EXCEPT A) the alleles in the gametes of each parent B) the actual results of a genetic cross C) the genotypes of the offspring C) all possible results of a genetic cross

7. 7. If a pea plant that is heterozygous for round, yellow peas (RrYy) is crossed with a pea plant that is homozygous for round peas but heterozygous for yellow peas (RRYy), how many different phenotypes are their offspring expected to show? A) 4 B) 16 C) 2 D) 8

8. 8. Gregor Mendel's principles of genetics apply to A) plants only B) all organisms C) pea plants only D) animals only

9. 9. Gametes have A) one allele for each gene B) homologous chromosomes C) twice the number of chromosomes found in body cells D) two sets of chromosomes

10. 10. Chromosomes form tetrads during A) metaphase I of meiosis B) interphase C) anaphase II of meiosis D) Prophase I of meiosis

11. 11. What happens between meiosis I and II that reduces the number of chromosomes A) Crossing-over occurs B) Replication occurs twice C) Replication does not occur D) Metaphase occurs

12. 12. Unlike mitosis, meiosis results in the formation of A) diploid cells B) 2N daughter cells C) haploid cells D) body cells

13. 13. Unlike mitosis, meiosis results in the formation of A) two genetically different cells B) four genetically identical cells C) two genetically identical cells D) four genetically different cells

14. 14. If the gene for seed color and the gene for seed shape in pea plants were linked, A) Mendel's F2 plants would have exhibited a different phenotype ratio for seed color and seed shape B) all of Mendel's F1 plants would have produced wrinked, green peas C) Mendel's F1 plants would have exhibited a different phenotype ratio for seed color and seed shape D) all of Mendel's P plants would have produced wrinkled, green peas

15. 15. If two genes are on the same chromosome and rarely assort independently, A) crossing-over never occurs between the genes B) crossing-over always occurs between the genes C) genes are probably located far apart from each other D) the genes are probably located close to each other