Polydactyly is expressed when an individual has extra fingers and/or toes. Assuming 50% 47) penetrance, a man with six fingers o
n each hand and six toes on each foot marries a woman with a normal number of digits. Having extra digits is caused by a dominant autosomal allele. The couple has a son with normal hands and feet, but the coupleʹs second child has extra digits. What is the probability that their next child will have polydactyly?
Amniocentesis detects abnormality in chromosomes, genetic disorders, and neural tube defects. Trisomy 21 (Down syndrome) is the most common chromosome abnormality.
