Problem 10.23 in book: There are 3.4 billion base pairs lined up end to end in one human DNA molecule, which contains the entire genetic code for the makeup of an individual person. Each base pair measures approximately 350 pm in length, and almost every cell in the body contains two complete DNA molecules. (a) If one DNA molecule was stretched end to end, how far would it stretch

Solution :

The total number of the base pairs in a human DNA molecule is given as

= 3.4 billion

= 3,400,000,000

The length of each of the pair of DNA  = 350 pm

a). Therefore the maximum length of the DNA when it is completely stretched end to end can be found out as  

                                                                  = 1.19 m

                                                                  = 0.00119 km

Now 1 km = 0.6213711 miles

∴ 0.00119 km would be = 0.00119  x 0.6213711

                                     = 0.000739432 miles.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

not sure if this what   you'r looking for would be percent composition