Biology - Intro to Genetics

Front

What is the definition of a hybrid organism?

Back

A hybrid organism has two different alleles for a trait, such as Bb.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a trait, such as BB or bb.

Front

What is the difference between homozygous dominant and homozygous recessive?

Back

Homozygous dominant has two dominant alleles (e.g., YY), while homozygous recessive has two recessive alleles (e.g., yy).

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-2

Front

What is a phenotype?

Back

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

Front

What does it mean for an organism to be purebred?

Back

A purebred organism has identical alleles for a trait, making it homozygous.

Front

What is the significance of the Punnett square in genetics?

Back

A Punnett square is a tool used to predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What is the expected genotype ratio from a cross between two heterozygous parents (Bb x Bb)?

Back

The expected genotype ratio is 1 BB : 2 Bb : 1 bb.

Front

What is the expected phenotype ratio from a cross between a homozygous dominant (BB) and a heterozygous (Bb) organism?

Back

The expected phenotype ratio is 100% brown fur.

Tags

NGSS.HS-LS3-1

Front

What is the definition of alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome.

Tags

NGSS.HS-LS3-2