in humans , cystic fibrosis is caused by a recessive allele on chromosome 7. a person must inherit two of these alleles to have the disease. what are the chances of a child having the disease if both of the parents are heterozygous

Which best describes meiosis? a. it produces cells that are identical to the original cell b. it is responsible for the replacement of damaged skin cells c. it is responsible for growth of the organism d. it produces male and female sex cells

The tubes transporting minerals and water upward are called ?

What must be done to breed dogs for a partical trait