#Question id: 5650
#Unit 5. Developmental Biology
Thalidomide, now banned for use as a sedative during pregnancy, was used in the early 1960s by many women in their first trimester of pregnancy. Some of these women gave birth to children with limb and organ deformities, suggesting that the drug most likely influenced ________.
#Question id: 5651
#Unit 5. Developmental Biology
Growth and development of plant parts involves ________.
I) cell division to produce new cells
II) enlargement and elongation of cells
III) specialization of cells into tissues
#Question id: 5652
#Unit 5. Developmental Biology
What generalization can be applied to the pole plasm of Drosophila, the P-granules of C. elegans, the yolk-free vegetal cytoplasm of Xenopus, and the localized mRNA for vasa in zebrafish?
#Question id: 5653
#Unit 5. Developmental Biology
Why is meiosis required for germ cell formation, yet is never used by somatic cells?
#Question id: 5654
#Unit 5. Developmental Biology
Two human disorders, Prader-Willi syndrome and Angelman syndrome, occur when a small deletion in a specific region of chromosome 15 is contributed by either the father or mother, respectively. Why does this small deletion not behave as a recessive allele for either syndrome, that is, why is its loss not made up for by the good copy of the region on chromosome 15 contributed by the other parent?
#Question id: 5655
#Unit 5. Developmental Biology
What is the "acrosomal reaction"?