All cells in an embryo have the same genes, but they express different subsets of this genome. Selective gene expression is the basis of:
a. cleavage
b. cell differentiation
c. fertilization
d. gamete formation
e. organ maturation
b
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The terms algae and protozoa have significant phylogenetic meaning
A. true B. false
The ____ of marine mammals receives normal blood supply during deep dives
a. lungs b. heart c. brain d. blood vessels e. heart, brain, and blood vessels
Which of these features is found in both nonvascular and vascular plants?
a. lignin b. roots c. cuticle d. xylem e. phloem
The term "karyotype" describes
a) A individual who is carrying a particular allele b) An assessment of the appearance and number of chromosomes in a nucleus c) An epidemiological study of how genetic traits are passed through generations d) The phenotype that arises from having a specific cancer-related gene mutation