& 53% 9:11 PM Student Name: Genetics Lab Midterm Exam Homozygous dominant and e.
ID: 91635 • Letter: #
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& 53% 9:11 PM Student Name: Genetics Lab Midterm Exam Homozygous dominant and e. None of the above All of the above sister chromatids a. None of the above 14, Round (R) seed shape is dominant to wr shape pea plants. If an RRPlant is with an m in the frequency of what is b, Kinetochore Spindle fibers d, Centriole in the F2 generation? a. All wrinkled seeds 11. When do Homologous chromosomes separate during 3 round seeds, I wrinkled seed None of the above d Metaphase 15. If a yellow pea plant with round seeds that ha GeWiw is crossed to what prop of the offspring will be green with wrinkle seed None of the above 12. When do sister chromarids separate during meiosis? e. None of the above 1616 13, which two genotypes in an individual would be expressed as the same phenotype in a diploid (Total 30 points) b Homoaypous recessive and 16. The four stages of Drosoplila life cycle in its correct order and approximately how long each stage takes? (5p Approximate time in days or hours ones that stay on the walls ofthe tube are from theExplanation / Answer
Answer10:D-Centriole:
Centrioles are involved in the organisation of mitotic spindle and in the completion of cytokinesis however they are not found in all the mitotic cells.
11.A-Anaphase I
In anaphase I the centromeres break down and homologous chrmosomes separate.
12.B-Anaphase II
At the completion of meiosis there are 4 daughter cells each with 1/2 the number of chromosomes as the mother cell.
13.C-Homozygous dominant and Heterozygous.
14.D-3 round seeds and 1 wrinkled seed.
15.B-1/16.
16.1.The insect drosophilla is around 3 mm as an adult and undergoes a larval and pupal stage prior to the adult stage.
2.A drosophila egg develops into an adult in 8.5 days.
3.embro remains a single cell cell during early development.
4.Gastrulation and segmentation in drosophila occurs ,the phenomenon of gastrulation begins 3
hours after fertilization this phase involves no cell division but after this phase cell division occurs.
5.Larval stages of drosophila:
-A female lays around 400 eggs and eggs hatch within 24 hours into first instar larvae.
-After 25 hours they form into larger worm like structures called the second instar larvae.
6.Pupal stage:
During this phase drosophila acquires wings and legs through homone induced metaphorphoses.
7.Adult stage:
The adult fly emrges from the operculum of the puparium and the female fly becomes receptive within 8 to 12 hours of emergence.
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