Tongue-rollers are dominant, and are represented with a capital r. non-
rollers are recessive, and are represented with a lowercase r.
if a person received the allele for the ability to roll her tongue from her
mother, and the lack of ability to roll her tongue from her father, what would
be her genotype and phenotype?
oa) rr; non-roller
ob) rr; non-roller
c) rr; tongue-roller
od) rr; tongue-roller
!

Rr; tongue-roller (C)

Explanation:

If her mom gave the R allele (ability to roll her tongue) and her dad gave the r allele (no ability to roll his tongue), you would combine the 2 and get Rr.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

protist eukaryotes that are not plants, animals, or fungi ("misfits")