Define the term 'gene' and explain its function.

A gene is a segment of DNA that contains the instructions for building proteins. These proteins carry out various functions in the body, determining traits.

What is the difference between homozygous and heterozygous alleles?

Homozygous alleles are identical copies of a gene, while heterozygous alleles are different versions of a gene.

Explain the concept of dominant and recessive alleles. How do they determine the expressed trait in a heterozygous individual?

A dominant allele masks the expression of a recessive allele when both are present in a heterozygous individual. The dominant allele determines the trait that is expressed.

If a person is heterozygous for a trait with 'T' being the dominant allele and 't' being the recessive allele, what is their genotype and phenotype?

Genotype: Tt, Phenotype: The trait associated with the 'T' allele.

Eye color is determined by multiple genes, with brown being dominant over blue. Could two brown-eyed parents have a blue-eyed child? Explain.

Yes, if both parents are heterozygous for the eye color gene (Bb), they can each pass on a recessive blue-eyed allele (b) to their child, resulting in a blue-eyed child (bb).

Genes And Inherited Traits Lesson Plan for Grade 10th Grade

Reading Passage

Genes and Inherited Traits

Genetics is the study of heredity, or how traits are passed from parents to offspring. These traits, such as eye color, hair texture, or even susceptibility to certain diseases, are determined by genes. Genes are segments of DNA that contain the instructions for building proteins, which carry out various functions in the body.

Each individual inherits two copies of each gene, one from each parent. These copies may be identical or slightly different; different versions of a gene are called alleles. If the two alleles are the same, the individual is homozygous for that gene. If the alleles are different, the individual is heterozygous.

When an individual is heterozygous for a trait, one allele may be dominant and the other recessive. The dominant allele will determine the trait that is expressed, while the recessive allele will be masked. For example, if a person inherits one allele for brown eyes (dominant) and one allele for blue eyes (recessive), they will have brown eyes. However, they can still pass the blue eye allele to their children.

Some traits are determined by a single gene, while others are influenced by multiple genes interacting together. The environment can also play a role in how genes are expressed. Understanding genetics is crucial for understanding how traits are inherited and how genetic variations can lead to differences among individuals.

Practice Questions

7 questions · Multiple choice & Short answer

Exit Ticket

Quick comprehension check

“Explain how genes determine inherited traits, including the concepts of alleles, homozygous/heterozygous conditions, and dominant/recessive alleles.”