Question
A crossover in meiosis is an exchange of genetic material between A. sister chromatids of the same chromosome B. sister chromatids of homologous chromosomes C. sister chromatids of non-sister chromatids D. non-sister chromatids of homologous chromosomes E. non-sister chromatids of non-homologous chromosomes. Mendel carried out his research on garden peas. You should remember he used seven pairs of traits. Modern geneticists have mapped the genes for Mendel's pairs of traits Two of them are on chromosome 1, Yet when Mendel carried out a dihybrid cross using these genes, his results led him to conclusion that they assorted independently. This makes sense if A. the two genes on are at least 20 mu apart B. the two genes on chromosome are more than 50 mu apart C, the two genes on chromosome are very close together D. the two genes on chromosome never recombine Garden peas have seven chromosome. Therefore they have ___linkage groups when they from gene locus p^from gene locus p^2. Therefore, you can be confident that gene locus X35 is about 12mu from gene locus p^2. A. True B. False Crossing over occurs during prophase I of meiosis. A. True B. False A dihybrid test cross is made between genes H and I. Four categories of offspring are produced: HI, Hi, hl, and hi. You use the X^2 test to test the hypothesis that the H and I genes are unlinked. How many degrees of freedom would there be in this test? A hypothesis that predicts no linkage between genes is called the hypothesis. A. null B. alternative Crossing over takes place in paired bivalents consisting of chromatids, and involves ____of the chromatids A. 2, 2 B. 2, 4 C. 4, D. 4, 4. E. 8, 4. The zipper-like connection between paired homologs in early prophase is known as a A. spindle fiber B. synaptonemal complex C. chiasma D. None of the above Chiasmata are structures of cross over between sister chromatids of homologous chromosomes. A. True B. False Here is a list of events during meiosis I in random order A. Homologous chromosomes are roughly aligned but not physically linked. B. Homologous chromosomes segregate to opposite poles. C. Homologous chromosomes are linked by synaptonemal complexes. D. Homologous chromosomes are linked by chiasmata. E. Chromosomes replicate. What is the correct order of these events? A. ACDBE B. AECDB C. EACDB D. EADCB E. CDABE Chromosomal interference is not uniform and may significantly vary within a region of a single chromosome A. True B. False Recombination due to crossing over occurs only rarely in mitosis. A. True B. False
Explanation / Answer
28. Ans: D
29. Ans: D
30. Ans: C
31. Ans: A
32. Ans: A
33. Ans: B
34. Ans: A
35. Ans: C
36. Ans: B
37. Ans: B
38. Ans: C
39.Ans: A
40. Ans: A
