Question
Which of the following pattern is considered to be between sister chromatids 2 & 4 during second division segregation (at anaphase I)? A. 4: 4 B. 2+: 2g: 2+: 2g C. 2g: 2+: 2g: 2+ D. 2g: 4+: 2g E. 2+: 4g: 2+ Which of the following pattern is considered to be between sister chromatids 1 & 3 during second division segregation (at anaphase I)? A. 4: 4 B. 2+: 2g: 2+: 2g C. 2g.2+: 2g: 2+ D. 2g: 4+: 2g E. 2+: 4g: 2+ What percent of parental chromatids you expect from a single cross over in second division segregation asci? A. 0 B. 25 C. 50 D. 75 E.100 What percent of recombinant chromatids you expect from a single cross over in second division segregation asci? A. 0 B. 25 C. 50 D. 75 E. 100 If you counted total of 18 (2: 4: 2)s in 300 asci, what is the recombination efficiency? A. 6 B. 18 C. 36 D. N72 What stage of Drosophila's life cycle was used to dissect out for polytene chromosome? A. Egg B. Larva C. Pupa D. Male adult E. Female adult What part of the body you dissected to visualize such chromosome? A. Gut B. Head (brain) C. Head (spinal cord) D. Salivary glands
Explanation / Answer
19) The life cycle stage of drosophila called larva was used to dissect out for polytene chromosome. During this stage the salivary glands become large and well developed.
20) The Salivary glands of Drosophila is used to dissect to visualize polytene chromosome.