Which is an example of cell differentiation and specialization? A. All mammal cells are identical.

B. Starting as stem cells, a
gene cuts on in each which leads to them changing into muscle cells, fat cells, nerve cells, and red blood
cells each having different jobs.

C. All cells have cilia at the adult stage.

D. The DNA is different in all body cells.

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

Describe characteristics of a good respitory surface

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?