Spinal Muscular Atrophy is an autosomal recessive genetic disorder in the SMN1 gene that leads to muscle deterioration and is often fatal (leads to death) before affected individuals reach adulthood. Carlos is a heterozygote for the gene. What is his genotype and does he have the disease? a
AA…yes, he only has the dominant alleles
b
Aa…yes, the dominant allele wins
c
aa…no, he only has the recessive alleles
d
Aa…no, but he is a carrier of the disease

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.