This site was home to the largest cleanup of hazardous waste in Texas history. 64 square miles of marine habitat and fishing waters had been contaminated in the late 1960's. Alcoa's aluminum manufacturing plant was dumping as much as 67 pounds of poisonous mercury per day into Lavaca Bay. They eventually stopped, but the damage had been done. The mercury accumulated, entered the food chain, and built up to unsafe levels throughout the ecosystem. Government officials had to eventually ban fishing activities in part of the bay due to health risks. This also hurt local fisherman and the local economy. NOAA (National Oceanic and Atmospheric Administration) and government partners created a new 70-acre marsh area and over 700
acres of coastal habitat was turned into a wildlife refuge. Before new habitats could be constructed, what did the government need to
do in this area?
A) remove the soil containing the mercury
B) fence the area to keep people out
C) ban fishing activities
D) shut down Alcoa

a

Explanation:

àä

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.