Explain why Duchenne muscular dystrophy (DMD), a recessive condition, most commonly occurs in boys. What will be an ideal response?
ANSWER: DMD is caused by mutations in the X-linked gene dystrophin. Since males have only one X
chromosome, they will express the recessive traits when only one defective, recessive allele
is present.
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Salt marshes differ from estuaries in that the freshwater input in salt marshes is from a single source.
Answer the following statement true (T) or false (F)
Plants are able to generate all of the substances they need for their metabolism using energy from the ____
a. soil b. air c. root d. Sun e. rain
Which type of plants are best adapted to hot, dry conditions?
a. C3 b. C4 c. CAM d. C3 and CAM e. C4 and CAM
Foreign species that have negative effects on native species are called:a
prey species. b. non-native species. c. invasive species. d. predator species. e. endemic species