CH 4

Question 1

describe the flow from egg to adult stages

Answer 1

-growth and development
egg
embryo
fetus, larva, larva/pupa
newborn, metamorphic, hatchling

-maturation
juvenile

-reproduce senescence
adult

Question 2

describe gene expression of hemoglobin (Hb) in embryo/fetus vs adults

Answer 2

• uterus has low PO2; hi O2 affinity Hb
• Hb can bind more tightly than adults
• embryo ( 2 epsilon and 2 alpha subunits)
• fetus (2 gamma and 2 alpha subunits)

adults have low O2 affinity
-2 beta and 2 alpha subunits

facilitates diffusion of O2 and transport to developing embryo/fetus