A ____ mutation changes the DNA sequence but has no impact on the fitness of the individual
a. beneficial
b. lethal
c. random
d. neutral
e. deleterious
ANSWER: d
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Based on the fossil record of the Rhynie cherts, what structures were present in the earliest vascular plants? Select all correct choices
A. stomata B. cuticles C. extensive root systems D. multi-veined leaves E. sporangia
What role does lignin play in a plant's adaptation to life on land?
A. It anchors the plant in the soil to allow plants to grow tall. B. It helps transport nutrients throughout the plant. C. It prevents drying out. D. It strengthens the cell wall to allow plants to stand up straight and tall.
In general, inversion and translocation heterozygotes are as fertile as organisms whose chromosomes are in the standard arrangement
Indicate whether the statement is true or false
When are hybrid zones expected to disappear and complete the speciation process?
a. when hybrids have a selective disadvantage b. when hybrids have a selective advantage and will replace parents c. when hybrids are found in ring species d. when hybrids mate assortatively