Biology Questions
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Most common cause of congenital malformation. Interaction of environmental influence with two or more genes * Neural tube defects are common --> due to folate deficiency in initial weeks of gestationAnencephaly: Encephalocele: Spinal dysraphism or spina bifida
What does the Mesonephric vesicles resemble?
When does the development of the definitive kidney occur?
When does the Development of Urinary Bladder, Urethra & Ureters occur?
What is the location of the definitive adult kidney?
When does the Pronephros become non-functional & regresses completely?
What are the precoursers of the primary mesechymal cells?
13. Explain how mutation and sexual reproduction produce genetic variation.
3. Describe the ideas and events that led to Darwin's 1859 publication of The Origin of Species
7. Describe two examples of natural selection known to occur in nature. Note two key points about how natural selection works
22. Explain how genetic variation is maintained in populations.
6. Explain why individuals cannot evolve and why evolution does not lead to perfectly adapted organisms
What was likely the first genetic material?
When was the Origin of Species published
The distribution of yolk is quite even and the amount is relatively small. When it divides, the cell membrane can completely separate into two cells. Each divided cell is equal in size.
As cells move to their target location during cell movement, cells start to differentiate. Cells differentiation makes cell morphology and function specialized and turns into different types of cells.
Cell activities are motivated by cell signals from itself, surrounding cells, or environmental signals. The signals introduce downstream effects to determine the cell fate.
In cleavage, cells divide quickly and do not grow in size. Total volume of zygote is unchanged and the cells become smaller at each division.
The notochord induces the ectoderm to thicken, fold, and form a neural tube.
The invagination process creates a structure called a dorsal lip. It is the inward buckling of an epithelium.