Question

3. Discuss the statement that says, "Development never ceases." Support your answer with theories/concepts of Development Biology. (10 points) 4. Contrast Genetic errors of development with Teratogenesis. Could gene therapy a solution to 0 this problem? Why? (10 points) 5. Proteins that regulate DNA repair and cell division (such as p53 and telomerase) maybe 0 important regulators of aging. So, I would rather eat protein-rich foods rather than buying expensive collagen products in combatting aging. Justify this statement. (10 points) 6. How is sex determined among animals? You may choose an animal you wanted to use

Answer 1

Question: 6. How is sex determined among animals? you may choose an animal you want to use

Sol: In animals, sex is determined by sex chromosomes, generally by the combinations of different sex chromosomes such as XY, ZW, XO or ZO

Example : Human beings (XY- males, XX- Females)

In Humans, Maleness is due to a dominant effect of 'Y' chromosome

On the Y chromosome a gene called 'SRY' gene or 'Sex determining Region on Y' is present

SRY gene is responsible for the production of Testes Determining Factor (TDF)

Production of TDF induce the embryonic gonads to develop into testes

Testes produce testosterone hormone that induce male sexual characters

In females (XX) there is no Y chromosome is present and no SRY gene product is formed or no TDF is produced

In the absence of TDF, no testosterone is produced

In the absence of Testosterone, embryonic gonads develop into ovaries