A pea plant is heterozygous for both seed shape and seed color. S is the allele for the dominant, spherical shape characteristic; s is the allele for the recessive, dented shape characteristic. Y is the allele for the dominant, yellow color characteristic; y is the allele for the recessive, green color characteristic. What will be the distribution of these two alleles in this plant's gametes?

Explanation:

Spherical shape (S) is dominant over dented shape(s), so  S is dominant over s;

Yellow (Y) is dominant over white color (y), so Y is dominant over y.

Here as given, parent is heterozygous for both parents.

so its genotype is= SsYy

Gametes formation follow both law of segregation and law of independent assortment:

So, 25% of gametes are SY

25% of gametes are Sy

25% of gametes are sY

25% of gametes are sy.

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 .. .