Cystic fibrosis, a disease that causes an accumulation of mucus in the lungs, results when a person is homozygous recessive for the autosomal trait (ff). if two parents who do not have cystic fibrosis give birth to a baby with cystic fibrosis, what are the parents’ genotypes? 1)ff, ff 2)ff, ff 3)ff, ff 4)ff, ff

#1 is the answer since there's a 25% chance that they will have a baby with Cystic fibrosis all the other answers would cause the baby to not have it or for the parents to have it.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !