DNA Chromosomes and genes

Front

What are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome, representing variations in traits.

Front

What organism did Gregor Mendel use for his genetic experiments?

Back

Gregor Mendel used pea plants to discover the principles of heredity.

Tags

NGSS.HS-LS3-2

Front

What is a chromosome?

Back

A chromosome is a bundled and organized structure of DNA that contains many genes.

Tags

NGSS.HS-LS3-1

Front

What is a gene?

Back

A gene is a segment of DNA that contains the instructions for building a specific protein or trait.

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NGSS.HS-LS1-1

Front

How many chromosomes do human cells have?

Back

Human cells have 46 chromosomes, arranged in 23 pairs.

Front

What is the role of DNA in heredity?

Back

DNA carries genetic information that is passed from parents to offspring, determining traits.

Tags

NGSS.HS-LS3-1

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their traits even when only one copy is present, while recessive alleles require two copies to express their traits.

Front

What is the structure of DNA?

Back

DNA is structured as a double helix, consisting of two strands twisted around each other, made up of nucleotides.

Front

What are the four bases of DNA?

Back

The four bases of DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.