Dimples is dominant. In a cross between a heterzygous female and a male without dimples, what percentage of their offspring would have dimples?
Answers
Answer:
Alleles and Diploids
Chromosomes carry their genes in the same place, but these genes have different versions, called alleles. Some alleles are dominant and some are recessive. In the case of dimples, one allele can tell the body to have dimples, while another may say "no" to the genetic trait. Children receive genetic instructions that define if they will inherit dimples from their parents' alleles.
Dominance and Dimples
A dimple is a dominant trait. Say John, who has two dominant dimple genes (DD), and Jane, who has two recessive dimple genes (dd), have a baby named Alice. Alice will receive one allele from each parent. Based on her parents' genetic information, she must receive one dominant allele from John and one recessive allele from Jane, so Alice's dimple alleles will be represented by Dd, meaning she will have dimples. Say Alice grows up and has children with Alan. If Alan also has one of each type of gene, their children can have one of four allele combinations: DD, Dd, dD and dd. In this case, their child is 75 percent likely to have dimples.