Mammals Birds
Reptiles
Amphibians
Fishes
Mollusks
World
United States
Arthropods
0 50 100 150 200 250 300 350 400
Number of Identified Species
20. Critique Do these numbers necessarily reflect
all species that may be in danger? Explain your
answer.
21. Assess Which types of species might be
underrepresented in the graph?
22. Analyze Compare the United States and world
listings. What trends do you see in the types of
species listed in the graph?
23. Evaluate Given this information, which types of
species might need further research worldwide?

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition.b) one-fourth of the daughters of an affected man would have this condition.c) one-half of the daughters of an affected father and a carrier mother could have this condition.d) only if a woman is xxx could she have this condition.