What would most likely cause two parents without any symptoms of a genetic disorder to have children who express the condition? pick one

1 Epigenetic modification causes the children to express dominant alleles for the condition

2 Both parents pass on a recessive allele on to the children

3 Codominant alleles cause the children to express the disease and healthy alleles

4 The parents must have had some symptoms but were not recognized due to being significantly less severe than in the children

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.