Understanding Genetic Inheritance: How Genes Control Physical Characteristics

The video tutorial explains how genes and chromosomes from each parent influence the physical characteristics of offspring. It covers the concept of alleles, which are different forms of the same gene, and how they contribute to genetic variation. The tutorial also discusses chromosome pairs, gene expression, and the difference between homozygous and heterozygous organisms. It further explains dominant and recessive alleles, using fur color inheritance in mice as an example to illustrate these genetic principles.

Which of the following statements is true about the control of physical characteristics?

• Genes do not interact with each other.

• Physical characteristics are not influenced by genes.

• Most characteristics are influenced by multiple genes.

• All characteristics are controlled by a single gene.

What is the term used to describe different forms of the same gene?

• Alleles

• Proteins

• Cells

• Chromosomes

If an organism has two identical alleles for a gene, it is considered:

• Recessive

• Dominant

• Heterozygous

• Homozygous

In the context of alleles, what does it mean if an allele is dominant?

• It is expressed only in the presence of a recessive allele.

• It is only expressed if two copies are present.

• It is never expressed.

• It is always expressed if at least one copy is present.

In the example of mice fur color, what does a lowercase 'b' represent?

• A dominant allele for brown fur

• A recessive allele for black fur

• A dominant allele for black fur

• A recessive allele for brown fur