(L8) Lessons 3&4 Flashcard Review

Front

What is a phenotype?

Back

A phenotype is an organism's appearance or other detectable characteristics, such as color or size.

Front

What does homozygous dominant mean?

Back

Homozygous dominant refers to having two identical dominant alleles for a trait, such as BB for brown fur.

Front

What is the result of crossing a homozygous dominant brown mouse with a heterozygous brown mouse?

Back

The result is 100% brown offspring.

Front

What does an open circle represent in a pedigree chart?

Back

An open circle represents a Not Affected Female.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup (e.g., BB, Bb, bb), while phenotype refers to the observable traits (e.g., brown fur).

Front

If green is dominant over purple, what is the genotype for a purple flower?

Back

The genotype for a purple flower is gg.

Front

What is a recessive allele?

Back

A recessive allele is an allele that is masked by the presence of a dominant allele and only expressed in a homozygous condition.

Front

What does heterozygous mean?

Back

Heterozygous means having two different alleles for a particular gene, such as Bb.

Front

What is a gene?

Back

A gene is a segment of DNA that codes for a specific trait.

Front

What is genetic variation?

Back

Genetic variation refers to the differences in DNA among individuals, which can lead to different traits.