Can anyone tell me real world examples in human about genetic linkage and association?

I have brown hair. My sister has red hair. The gene for brown hair is dominant ie if I have one brown gene I have brown hair. Therefore both of my parents must have had the red hair gene.

 

I have roses. One is red, One is white and another is pink.

A genetic cross of the red and white yields the pink color since neither gene is dominant. However breeding two pink roses can yield red(25% chance)/white(25% chance) or pink.(50% chance). Breeding red with red yields red and vice versa. Given the above information I have to move house however I can only bring one rose type with me. Which type of rose should I bring? This is a small example. Another would be the red flowers are tall and the white flowers are short. Cross the red and white flowers to make a tall white flower.

 

I have a horse and a donkey which I can cross to make a mule. However mules tended to be infertile. Which is explained in wiki

Mules and hinnies have 63 chromosomes, a mixture of the horse's 64 and the donkey's 62. The different structure and number usually prevents the chromosomes from pairing up properly and creating successful embryos, rendering most mules infertile.

 

In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46.

 

carrots

 

Edited August 28, 201411 yr by fiveworlds