Bio Staar Review

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does homozygous mean?

Back

Homozygous refers to an organism that has two identical alleles for a particular trait, such as RR or rr.

Front

What does heterozygous mean?

Back

Heterozygous refers to an organism that has two different alleles for a particular trait, such as Rr.

Front

What is the phenotypic ratio for a monohybrid cross?

Back

The phenotypic ratio for a monohybrid cross between two heterozygous parents is typically 3:1.

Front

What is the genotypic ratio for a monohybrid cross?

Back

The genotypic ratio for a monohybrid cross between two heterozygous parents is 1:2:1.

Front

What is natural selection?

Back

Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.

Front

What are alleles?

Back

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

Front

What is the difference between dominant and recessive alleles?

Back

A dominant allele is expressed in the phenotype even when only one copy is present, while a recessive allele is only expressed when two copies are present.

Front

What is a genotype?

Back

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

Front

What is a phenotype?

Back

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