Although birds, fish, mammals, reptiles and amphibians are different, evidence of their evolutionary
links is provided by
a. chemical analysis.
b. comparison of adult body forms.
c. comparison of ways in which their embryos develop.
d. time of gestation.
e. comparing life expectancies.
C
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Below is a pedigree of a fairly common human hereditary trait; the boxes represent males and the circles represent females. Filled-in symbols indicate the abnormal phenotype
Given that one gene pair is involved, (a) Is the inheritance pattern X-linked or autosomal? (b) Give the genotype of each individual in the pedigree. If more than one genotypic possibility exists, present all possible alternatives.
The organisms occupying the base of a pyramid of energy are autotrophs
____________________ Indicate whether the statement is true or false.
When substances move across a plasma membrane and down concentration gradients, this is called
A) pinocytosis. B) active transport. C) passive transport. D) exocytosis.
A number of studies have found that for many plants there is an increase in seed production under conditions of elevated carbon dioxide levels. What is a likely explanation for this phenomenon?
A) The energy needed to produce seeds comes from carbon dioxide. B) The carbon needed to produce new plant molecules through photosynthesis requires carbon dioxide. C) Increased carbon dioxide levels cause increased cell respiration, which is needed to produce more seeds.