Nondisjunction is the failure of homologous chromosomes to separate during meiosis i, or the failure of sister chromatids to separate during meiosis ii or mitosis. as a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell. this produces daughter cells with an imbalance of chromosomes. a cell biologist examines the final products of meiosis in an earthworm (2n=36) and finds 2 cells with 20 chromosomes, and 2 cells with 16 chromosomes. most likely this was because

Most likely this was failure of nondisjunction occurred during meiosis I resulted with 2 pairs of homologous chromosomes failed to separate. Explanation:

Simple explanation is that if nondisjunction occurs in meiosis II, there would be 3 types of cells; n-2, n-1 and n. And if nondisjunction occurs in meiosis I there would be two types of cells n+2 and n-2 (see figure). If the 2n = 36 than n should equal to the 18. There are two types of cells n +2 (20 chromosomes) and n-2 (16 chromosomes) so answer is "nondisjunction in meiosis I".

events in order:

1.       vishnu schist

2. zoroaster granite

3. bass limestone

4. hakatar   shale

5. igneous intrusion

6. shinumo quartzite

7. dox sandstone

8. tapeats limestone

9. bright angel shale

10. muav limestone

11. temple butte limestone

12. redwall limestone  

nonconformity

answer: the unkar group shows angular unconformity because the layers are turned at angle.

unconformity

answer: specifically the angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled. an angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled.

disconformity

answer: the disconformities aremarked irregular lines between the sedimentaryrocks layers.

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