Lesson 1- Changing The Living World Flashcards
(Blank) (blank) allows only those organisms with desired characteristics to produce the next generation.
Selective breeding
Nearly all domestic animals and most crop plants have been produced by (Blank) (blank)
selective breeding
Humans use selective breeding to (sentence blank)
pass desired traits on to the next generation of organisms.
(Blank) is the crossing of dissimilar individuals to bring together the best of both organisms.
Hybridization
(Blank), the individuals produced by such crosses, are often hardier than either of the parents.
Hybrids
(Blank) is the continued breeding of individuals with similar characteristics
Inbreeding
Inbreeding helps to ensure that the characteristics that make each breed unique will be (blank)
preserved
(Blank) (blank (blank) can result from excessive inbreeding.
Serious genetic problems
Breeders increase the genetic variation in a population by (blank) (blank)
inducing mutations
Mutations occur spontaneously, but breeders can increase the mutation rate by using (blank) and (blank).
radiation and chemicals
Breeders can often produce a few mutants with desirable characteristics that are not found in the (blank) (blank).
original population
Introducing mutations has allowed scientists to develop hundreds of useful bacterial strains, including (blank sentence)
bacteria that can clean up oil spills
Mutations in some plant cells produce cells that have double or triple the normal number of (blank).
chromosomes
Producing New Kinds of Plants
Thus, condition, known as polyploidy, produces new species of plants that are often larger and stronger than their (blank) (blank)
diploid relatives
Producing New Kinds of Plants
(Blank) in animals is usually fatal.
Polyploidy
