LS3.3 EOC Pre-Assessment

Front

What is the probability of offspring having short tusks when a heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant?

Back

50%

Front

What is one form of a gene called?

Back

An allele

Front

What does it mean to have two of the same genes for a trait?

Back

Homozygous

Front

If a rabbit has brown fur, what can you conclude about its genotype?

Back

It is bb.

Front

How many alleles does an offspring receive from each parent to determine a specific trait?

Back

One

Front

What is the definition of a phenotype?

Back

The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.

Front

What is the definition of a genotype?

Back

The genetic constitution of an individual, specifically the alleles present.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait, while heterozygous means having two different alleles.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that will express itself in the phenotype even if only one copy of the allele is present.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that will only express itself in the phenotype if two copies of the allele are present.