Cystic fibrosis is an autosomal recessive disorder that affects lung function in humans. a man and a woman are both unaffected heterozygous carriers of a cystic fibrosis gene. if the couple has two children, what is the probability that their first child will be unaffected and their second child will be unaffected?

By going through the process of cellular respiration the cell can gain molecules of atp.

How do you suppose living conditions differ between the country furthest along in the demographic transition compared to the country earliest in the transition? how would living conditions in these two countries affect both birth and death rates?

According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this?               a.  this implies that dna and proteins aren't essential in cells today.    b.  this implies that rna can catalyze any chemical reaction that enzymes catalyze.    c.  this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna.    d.  this implies that dna and proteins evolved after rna.