Biology STAAR Review - Reporting Category 2

Front

What is the expected percentage of homozygous smooth-haired offspring when two heterozygous dogs (Hh) are crossed?

Back

25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What type of genetic cross would produce albino offspring in rabbits?

Back

A cross between two homozygous recessive rabbits (aa).

Front

How is gene expression for enzymes in E. coli controlled?

Back

Gene expression for the enzymes is controlled by the presence of lactose.

Front

What is a common characteristic shared by trees, cats, and amoebas?

Back

They contain DNA composed of the same four types of nucleotides.

Front

What is an insertion mutation?

Back

An insertion mutation is a type of mutation where one or more nucleotide base pairs are added into a DNA sequence.

Tags

NGSS.HS-LS3-2

Front

Define homozygous and heterozygous genotypes.

Back

Homozygous genotypes have two identical alleles for a trait (e.g., HH or hh), while heterozygous genotypes have two different alleles (e.g., Hh).

Front

What is a Punnett square used for in genetics?

Back

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

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-3

Front

What are alleles?

Back

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

Tags

NGSS.HS-LS3-2

Front

Explain the significance of the four types of nucleotides in DNA.

Back

The four types of nucleotides (adenine, thymine, cytosine, guanine) are the building blocks of DNA and determine the genetic code.

Tags

NGSS.HS-LS1-1

Front

What is the role of lactose in E. coli gene expression?

Back

Lactose acts as an inducer that triggers the expression of genes coding for enzymes that break down lactose.