Aresearcher is studying mice that carry a mutant allele of a gene called pax3. animals heterozygous for this mutation demonstrate a malformed nervous system, a cleft palate, and abnormal fur pigmentation. as this mutant pax3 allele affects several mouse traits, this allele is:

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

What organs comprise the respiratory system of a bird