Genetics Answers

mRNA direct the building of proteins through a sequence of? A) exons. B)introns. C)codons. D)anticodons expain both correct nad false answer with reason

Here's a link and my question relates to the diagram present in the link: http://biology.stackexchange.com/questions/48923/crossing-over-holliday-model

Why is the heteroduplex with constant terminal genes called a non-crossover despite exchange of middle DNA segments?

Who is father of experimental genetics? Is it T.H.Morgan?

Which of following is/are exception(s) of independent assortment ? Why?
1.Duplicate dominant epistasis
2.Complementary gene action/ Duplicate recessive epistasis
3.Linkage

Which of following is/are exception(s) of Law of segregation ? Why?
1. Parental imprinting
2 Random inactivation
3.Maternal effect
4.Incomplete penetrance
5.Nondysjunction
6. Meiotic drive
7.Lethal alleles
Note: You may just explain in a word or two for I understand these phenomena.

Is father of modern genetics T.H.Morgan?

There are several opinions on this topic mostly the internet shows that its Mendel. But according to my knowledge it should be Morgan. Who's the father of modern genetics?

When the dihybrid test cross ratio comes out to be 1:1:1:1 it means that the genes are not linked and they assort independently. But from there could we say that the genes are not present on same chromosomes?

I'm thinking this because the genes present on a chromosome form a linkage group that means they are linked.So could we say that the genes involved are not present on the same chromosomes but on different chromosomes?

What is the difference between pi RNA and mi RNA?
(It has something to do with single stranded state and double stranded state, isn't it?)

Balanced lethal is a true-breeding heterozygous organism maintained in a stable state through the existence of different lethals on each of a pair of homologous chromosomes and resulting in loss of all homozygotes.
I don't get this definition completely. Does this mean that balanced lethal is an organism which survives due to the existence of heterozygosity of lethal alleles?