The pedigree above shows a cross between an affected female and unaffected male for Huntington's disease. Huntington's disease is autosomal dominant. If both parents have Huntington's disease, what are the chances that they will have children who do NOT have the disease?

A) 0%
B) 5%
C) 25%
D) 50%

The correct option is A) 0%

Explanation:

Huntington's disease can be described a progressive neurodegenerative disorder which is characterized by symptoms such as trouble in cognitive recognition, difficulty in movement etc.

It is a autosomal dominant disorder. This means that only one of the faulty alleles can cause the disease in a person. Hence, if both the parents of a person have Hungtinton's disease, then all the children will carry the disease.

A

Explanation:

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.