Unit 4 : Genetics - Flashcard 1

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of two different alleles for a particular gene, such as Bb.

Front

In a heterozygous genotype like Bb, which allele is expressed?

Back

The dominant allele is expressed.

Front

What are alleles?

Back

Alleles are different versions of a trait, such as tall or short, white or purple.

Front

What does DNA stand for?

Back

DNA stands for Deoxyribonucleic acid.

Front

What is a Punnett square used for?

Back

A Punnett square is used to predict the genetic outcomes of a cross between two organisms.

Front

What fraction of offspring will have wrinkled, yellow seeds if the ratio is 3/16?

Back

3/16 of the offspring will have wrinkled, yellow seeds.

Front

If an organism is heterozygous, what is another term that can describe it?

Back

Another term for heterozygous is hybrid.

Front

What is a dominant allele?

Back

A dominant allele is an allele that is expressed in the phenotype even when only one copy is present.

Front

What is a recessive allele?

Back

A recessive allele is an allele that is only expressed in the phenotype when two copies are present.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits.