What is the phenomenon of a single gene determining a number of distinct and seemingly unrelated characteristics?

With the principle of segregation, what is the relationship of the dominant phenotype with respect to the recessive in heterozygous individuals?

How Independent Assortment Leads to Extensive Genetic Variation ?

What is pedigree data?

A trait with a high concordance value in MZ twins has a   a) significant environmental component. b) significant random component. c) significant inherited component. d) no conclusions can be drawn in this case.

The original source of all genetic variation is what?

An unaffected woman for a human disorder marries and unaffected man and they have children. This results in 3 affected sons, and one unaffected daughter, which ends up having children later on with an unaffected man and has 2 affected sons. A) Draw a simple pedigree diagram for this family, including a legend. B) What is the likely mode of inheritance of this trait: Please explain C) Provide the genotypes of the original mother and the daughter. Use a capital letter for the dominant allele and lowercase letter for the recessive allele. D) If one of the affected sons from the original marriage marries a 2nd cousin that is a carrier of this trait and has children, what is the probability that they will have 3 affected sons?

Briefly describe what is a meaning of genetic variation.