Genetics Answers

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?

What are balanced lethal. Please do explain with an example and simple english.

Is the following correct?
What is criss-cross inheritance?
Criss-cross inheritance is the inheritance of a X-linked recessive trait from grandfather to grandson through a carrier mother.

''A major function of p53 is to protect the genome from harmful mutations, that is, to prevent genetic instability, justifying the name “guardian of the genome.”- how does it actually protect the genome from harmful mutation and why is it called the guardian of the genome? Please explain

Definition of cryptic satellite DNA: A satellite DNA sequence that cannot be separated from the main-band DNA by density gradient ultracentrifugation.

What's the meaning of main-band DNA.?

How is RNA silencing different from RNA interference?

Are the following two definitions correct?
Incomplete linkage: The phenomenon of inheritance of recombinant/non-parental combination of genes due to presence of crossing over is called incomplete linkage.
Complete linkage: The phenomenon of inheritance of parental combination of genes due to absence of crossing over is called complete linkage.

In the cross performed by Punnet and Batson on Latyrus Odoratus the plants with only C_P_ genotype i.e with two dominant allele have purple colour. At molecular level this is because the two dominant alleles encode for two enzymes that are envolved in anthocyanin synthesis. Due to absence of one dominant allele (i.e. genotype C_pp or ccP_) the anthocyanin pigment is not produced and the flower is white.
I was reading Snustard and Simmon's Principle of genetics and it said that the reccessive alleles i.e ccP_ or C_pp have an epistatic effect on the dominant alleles. It didn't make sense to me. I mean at molecular level the recessive alleles(i.e. cc and pp) have no role in supressing the expression of dominant allele of another gene, isn't it?

What are silent carrier traits?

What are pyrimidine dimers? Please explain it.