PBS - Exit Ticket - 5/7

Front

What is DNA?

Back

DNA (Deoxyribonucleic Acid) is the molecule that carries the genetic instructions for life. It is composed of two strands that coil around each other to form a double helix.

Front

What does it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype. For example, in mice, black fur (B) is dominant over white fur (b).

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genetic makeup of offspring from a particular cross or breeding experiment.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait (e.g., AA or aa), while heterozygous means having two different alleles for a trait (e.g., Aa).

Front

What are nitrogen bases?

Back

Nitrogen bases are the building blocks of DNA and RNA. In DNA, the four bases are adenine (A), thymine (T), cytosine (C), and guanine (G).

Front

What is the structure of a DNA double helix?

Back

The DNA double helix consists of two strands of nucleotides twisted around each other, with the sugar and phosphate forming the backbone and nitrogen bases forming the 'steps'.

Front

What is systolic pressure?

Back

Systolic pressure is the pressure in the arteries when the heart beats and pumps blood. It is the higher number in a blood pressure reading.

Front

What is the role of alleles in genetics?

Back

Alleles are different versions of a gene that determine specific traits. They can be dominant or recessive.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is one that is only expressed when two copies of the recessive allele are present in the genotype.

Front

How do you determine the genotype from a phenotype?

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The phenotype is the observable trait, while the genotype is the genetic makeup. To determine the genotype, you may need to perform a test cross or analyze offspring.