Bio A unit 3 alt. mastery tests

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive. Example: A flower with red and white spots from red and white parents.

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation where one allele does not completely dominate another, resulting in a third phenotype that is a blend of the two. Example: A red flower crossed with a white flower producing pink flowers.

Front

What is polygenic inheritance?

Back

Polygenic inheritance is a type of inheritance where multiple genes determine a single trait, leading to a wide range of phenotypes. Example: Human skin color is influenced by several genes.

Front

What is the significance of DNA replication?

Back

DNA replication is crucial for passing on genetic information from parents to offspring, ensuring that each new cell has the same genetic material.

Front

What does the genotype Tt represent?

Back

The genotype Tt represents a heterozygous condition where one allele is dominant (T) and the other is recessive (t), resulting in the dominant phenotype.

Front

What is the expected phenotype ratio in a monohybrid cross?

Back

In a monohybrid cross between two heterozygous parents (Tt x Tt), the expected phenotype ratio is 3:1, where 3 show the dominant trait and 1 shows the recessive trait.

Front

What is an X-linked dominant trait?

Back

An X-linked dominant trait is a genetic condition that is expressed in individuals who have at least one copy of the dominant allele on the X chromosome, affecting both males and females.

Front

What is the probability of a child inheriting an X-linked dominant trait from an affected mother?

Back

If a female with an X-linked dominant disease mates with a normal male, there is a 50% chance that each child will inherit the disease.

Front

What is a mutation?

Back

A mutation is a change in the nucleotide sequence of DNA, which can lead to changes in the structure and function of proteins.

Front

What is substitution mutation?

Back

A substitution mutation occurs when one nucleotide in the DNA sequence is replaced by another, potentially altering the amino acid sequence of a protein.