Genetics Concepts and Terminology

Mrs. White Caramel introduces a Grade 12 genetics lesson, covering key concepts such as chromatin networks, chromosomes, DNA replication, genes, alleles, genotypes, phenotypes, and the roles of dominant and recessive alleles. The lesson emphasizes understanding genetic material, its replication, and expression in organisms.

What is the main focus of the first lesson on genetics?

• The history of genetics

• Introduction to genetics and its importance

• Genetic mutations

• The structure of DNA

What is a chromatin network?

• A form of RNA

• A type of organelle

• A tangled mass of genetic material in the nucleus

• A type of cell membrane

During which phase does DNA replication occur?

• Anaphase

• Interphase

• Metaphase

• Prophase

What is a gene?

• A segment of DNA that codes for a characteristic

• A type of protein

• A complete DNA molecule

• A form of RNA

What is non-coding DNA?

• DNA that codes for proteins

• DNA that does not code for any characteristic

• DNA that is always active

• DNA that is found outside the nucleus

What are alleles?

• Identical forms of a gene

• Different forms of a gene at the same locus

• Segments of RNA

• Proteins that bind to DNA

How is a dominant allele expressed?

• Only in the presence of a recessive allele

• Only in recessive conditions

• Only in homozygous conditions

• In both heterozygous and homozygous conditions

What does genotype refer to?

• The physical appearance of an organism

• The genetic makeup of an organism

• The diet of an organism

• The environment of an organism

What determines the phenotype of an organism?

• Its age

• Its environment

• Its genotype

• Its diet

When is a recessive allele expressed?

• In the presence of a dominant allele

• In heterozygous conditions

• In homozygous recessive conditions

• In the presence of a different gene