Selective Breeding and Genetics Concepts

Mr. Wheeler's lesson on applied genetics covers selective breeding, including hybridization and inbreeding. He explains the methods, challenges, and examples of each, highlighting the importance of maintaining or combining desirable traits. The lesson also covers test crosses to determine genotypes, using examples to illustrate the concepts.

What is the main goal of selective breeding?

• To obtain desired traits in plants and animals

• To eliminate all genetic diversity

• To create new species

• To increase the population size

Which of the following is NOT a method of selective breeding?

• Cloning

• Cross-pollination

• Inbreeding

• Hybridization

Which method of selective breeding involves maintaining existing desirable traits?

• Hybridization

• Inbreeding

• Cross-pollination

• Genetic engineering

What is a potential risk of inbreeding?

• Development of homozygous recessive traits

• Improved disease resistance

• Increased genetic diversity

• Faster growth rates

What is the primary challenge associated with hybridization?

• It is only applicable to animals

• It is inexpensive

• It reduces genetic diversity

• It is time-consuming and costly

How have watermelons changed due to hybridization over the centuries?

• They have become smaller

• They have become more segmented like citrus fruits

• They have developed larger seeds

• They have become more colorful

What is a common goal of both hybridization and inbreeding?

• To maintain genetic diversity

• To eliminate all genetic traits

• To create entirely new species

• To achieve true breeding populations

What is the purpose of a test cross in genetics?

• To increase the population size

• To determine the genotype of an organism

• To eliminate recessive traits

• To create new genetic traits

In a test cross, what does it indicate if all offspring display the dominant phenotype?

• The unknown genotype is heterozygous

• The unknown genotype is homozygous recessive

• The unknown genotype is homozygous dominant

• The unknown genotype is a hybrid

What is the result if a test cross produces offspring with both dominant and recessive phenotypes?

• The unknown genotype is a new species

• The unknown genotype is homozygous recessive

• The unknown genotype is heterozygous

• The unknown genotype is homozygous dominant