Genetics Concepts and Terminology

This video tutorial by Mr. Thompson covers the basics of genetics, focusing on inheritance. It explains alleles, their variations, and the concepts of dominant and recessive genes. The video also discusses genotype and phenotype, and explores different degrees of dominance, including complete, co-dominance, and incomplete dominance. It introduces Punnett squares as a tool for predicting genetic outcomes and concludes with an overview of pedigree charts for tracking traits across generations.

What are alleles?

• Dominant genes only

• Chromosomes passed from parents

• Variations of a gene for a particular trait

• Different genes for different traits

How is a dominant allele represented?

• With a symbol

• With a number

• With a capital letter

• With a lowercase letter

What is the phenotype?

• The combination of alleles

• The physical expression of a trait

• The genetic makeup of an organism

• The environment's effect on genes

What does heterozygous mean?

• Having only dominant alleles

• Having two identical alleles

• Having two different alleles

• Having only recessive alleles

In codominance, how are traits expressed?

• Only the dominant trait is visible

• Only the recessive trait is visible

• Both traits are fully expressed

• Traits are mixed into an intermediate form

What is the purpose of a Punnett square?

• To track family history

• To determine the genotype of an individual

• To predict the probability of traits in offspring

• To identify genetic disorders

In a Punnett square, what does a 50/50 result indicate?

• The trait is not inherited

• Half of the offspring will have one trait, and half will have another

• All offspring will have the same trait

• The trait is recessive

What do circles represent in a pedigree chart?

• Males

• Recessive traits

• Females

• Dominant traits

What does a filled shape in a pedigree chart indicate?

• The individual is unaffected by the trait

• The individual does not have the trait

• The individual is a carrier of the trait

• The individual has the trait

What does a horizontal line between two shapes in a pedigree chart represent?

• Generational gap

• Unrelated individuals

• Breeding pair

• Siblings