bio tets

The short-legged Ancon sheep is descended from a mutant ram discovered in Dover, Massachusetts in 1791. Why did this mutation become established?

The Ancon sheep was bred by humans because ranchers did not need to build high fences to contain it.

Mutations can be both harmful and helpful. Indicate which of these can be caused by a genetic mutation.

cystic fibrosis

Which statement BEST describes how mutations are related to evolution?

d- Mutations lead to new genes, which may have an advantage over the old forms, causing the species to evolve.

When DNA replication occurs before meiosis, the original DNA strand GTC ACA GGC ATC is copied into complementary strand CAG CCG TAG. What type of mutation has occurred?

deletion

The karyotype indicates a problem with chromosome 18. What is the problem and what is the BEST explanation for why it occurred?

extra chromosome; nondisjunction

uring the replication process, polymerase proofreads the DNA molecule so that few mistakes or ___________ occur.

mutations

Which mutation causes either the inclusion of an extra chromosome in offspring or the deletion of an entire chromosome?

non-disjunction

How can a genetic disorder, such as Turner's syndrome, occur?

nondisjunction during meiosis

The substitution, addition, or removal of a single nucleotide in DNA is called a(n) ____________ mutation.

point