PLEASE HELP ME- Population Genetics!?

Question

1- Assuming we have a Hardy-Weinberg equilibrium population & the frequency of the dominant allele "B" is 90% & that "b", the recessive allele is the only other allele at this gene locus in the population, what would be the expected frequency of Heterozygous individuals in this population?

2-Why would a female animal prefer to mate w/ a male who is both physically attractive & a good father?

3- List 2 General Structural features that Annelids & Arthropods Share?
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1- ?? I don't really understand what I'm doing at all.
p +q= 1
0.9 +0.1= 1.00
B= 90%
b=10%
Is this even close?... PLEASE explain this to me, I'm so Confused!

2- Physically attractive= So that the offspring will have good alleles & so when the time comes, it won't have so much trouble finding a mate?
Good father= to proveide protection, & give female comfort & relief? Does that explain WHY though?

3- ?

Please Help Me. I would really appreciate it! Thank You so Much! = )

Answer 1

1. The frequency for heterozygotes is 0.18. You correctly figured out the recessive allele frequency with p + q = 1. Therefore, q=0.1. The frequency of heterozygotes equals 2pq from q^2+2pq+q^2=1.

Answer 2

I can help you with 2.
This question brings into play two elements involved in evolutionary pressure. Natural selection (the good father/provider) and sexual selection (good looks). The best examples of sexual selection are found in birds, where male birds are colourful, flamboyant, and may have developed fantastic tail feather plumage (eg Peacock, Birds of Paradise) even at the risk of being easier prey to predators, just so that they will be selected as a mate by the drab coloured female. Examples of natural selection, ie selection of genetic material based on the ability to survive, is probably best demonstrated by wild goats and deer head butting each other while competing for females. Although there is a sexual selective force involved, in that the female may have a choice in the matter, being a good father and provider has clearly given him and advantage over other males, and his genes have survived to the next generation.