18.Camels have a diploid chromosome number of 70. At prophase II, each cell woul

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18.Camels have a diploid chromosome number of 70. At prophase II, each cell would contain how many tetrads? A. 0 B. 35 C. 70 D. 140 E. 280 19) Crossing over between sister chromatids does not result in recombination of genetic material while crossing over between non-sister chromatids does because... a. sister chromatids have the same alleles while non-sister chromatids have different ones b. sister chromatids have the same genes while non-sister chromatids have different ones c. sister chromatids have the same alleles but different genes while non-sister chromatids have different alleles but the same genes d. non-sister chromatids have the same alleles while sister chromatids have different ones e. non-sister chromatids have the same genes while sister chromatids have different ones 20) The possibility of Down syndrome increases as the mother's age increases because a. her DNA is damaged through an accumulation of replication errors b. her DNA stops checking for replication errors c. fertilization no longer occurs correctly with older eggs d. the contents of the egg contains the wrong signals for the correct development of the fetus e. the possibility of nondisjunction increases 21) The garden pea was a good model for Mendel's genetics experiments. Which of the following is NOT true regarding this model organism? a. The plants were easy to grow b. Pea plants can either cross-pollinate or self-pollinate c. There was only one variety of pea available to Mendel d. The plants had several traits that were easily identified e. Most of the traits studied had no intermediate stage 22) The filled-in squares of a Punnett square represent... a. the numbers of individuals with each version of a trait b. all possible combinations of gametes based on a cross between the two parents c. an exact ratio that must always occur when the same parents have 4 offspring d. examples of some of the offspring that can arise from a one-trait cross e. the gametes from one parent 23) alleles are... a. dominant traits b. recessive traits c. 2 versions of the same trait d. Alternate versions of the same trait e. Exact copies of the same trait 24. lf a heterozygous dominant tall pea plant is crossed with a short pea plant, what is the expected phenotypic ratio of tall:short plants? a. 1:1 b. 1:2 c. 3:1 d. Alltall e. Allshort

Explanation / Answer

18.c 19.a 20.b 21.b 22.a 23.c 24.d

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