Mycorrhizae associations are
A) very unusual.
B) common; at least 80% of the species of plants form these associations.
C) common only in nutrient-rich environments.
D) absolutely necessary for survival.
E) common only to species, such as grasses.
B
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Constitutive genes are those that have constant levels of expression
Indicate whether the statement is true or false
If an organism has two non-identical versions of a gene, the one that is not expressed in the organism is called the __________
Fill in the blank(s) with the appropriate word(s)
In fruit flies, the genes for body color and wing shape are linked. When a dihybrid black straight-winged fly is test-crossed with a double-recessive brown curly-winged fly, the frequency at which black curly-winged and brown straight-winged flies are seen in the progeny is called the _______ frequency.
A: mutation B: recombinant C: allele D: parental E: meiotic
The system that helps all others maintain homeostasis by transporting oxygen, nutrients, carbon dioxide, and wastes is the.
a) circulatory system b) respiratory system c) excretory system d) digestive system