Development of an animal is connected to the genes that are expressed during development. What roles have been proposed for Hox genes in the evolution and morphology of animal species? Select all that apply.
_____ Variation in the number of Hox genes has led to the evolution of new animal species.
_____ An increase in the number of Hox genes leads to an increase in the body size of an animal.
_____ The greater the number of Hox genes the more complex the body plan of the animal.
_____ The clustering of Hox genes has only evolved in vertebrates and is responsible for the evolution of vertebrae.
__X__ Variation in the number of Hox genes has led to the evolution of new animal species.
_____ An increase in the number of Hox genes leads to an increase in the body size of an animal.
__X__ The greater the number of Hox genes the more complex the body plan of the animal.
_____ The clustering of Hox genes has only evolved in vertebrates and is responsible for the evolution of vertebrae.
You might also like to view...
Which one of the following statements is true of the 32 allele in the CCR5 gene? (Choose all that apply)
A. It codes for a mutant protein that is completely inactive. B. It leads to a deletion which maintains the reading frame. C. It provides some protection against HIV progression to AIDS in both its heterozygous and homozygous forms. D. It is an example of a beneficial mutation. E. It affects the attachment of HIV to an animal cell by altering one of the viral proteins.
Another name for bovine spongiform encephalopathy (BSE) is ____________________
Fill in the blank(s) with correct word
Neuropeptide neurotransmitters
a. can act as a direct neurotransmitter between neurons and muscle cells. b. can act as a postsynaptic membrane inhibitors. c. directly open K+ channels to inhibit neurons. d. can act as pain reducers and initiate euphoria. e. directly inhibit euphoria.
Deep in the ocean where there is no light, some
bacteria can use the energy of chemicals to make carbohydrates. Animals, such as tube worms, derive their carbohydrates from consuming those chemosynthetic bacteria. Given these facts, a tube worm would be considered to be a(n) ____, whereas the bacteria would be a(n) ____.
a. producer; consumer b. autotroph; heterotroph c. prokaryote; eukaryote d. heterotroph; autotroph e. decomposer; producer