A human trait is influenced by a single pair of genes, with T representing the dominant gene and t representing the recessive gene. Joe (genotype Tt) and Meg (genotype Tt) decide to have children. According to the principles of Mendelian heredity, what percentage of their children would exhibit the trait?
a. 25
b. 50
c. 75
d. 100
Question 2
If blonde hair is dominant and designated as B and brunette hair is recessive and designated as b, probability would predict that if a couple each with a Bb hair color genotype had four children, _____ would have blonde hair.
a. one
b. two
c. three
d. four
Single blood cell
Identical twins share 100 percent of their segregating genes.
Skin color is a polygenic trait controlled by three or four genes, producing a wide range of phenoty
Partial map of disease genes on human chromosome 21
Human brain and skull
Morgan’s test-cross analysis of genetic linkage between autosomal genes