2024-25 Fall Semester Review

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does homozygous mean?

Back

Homozygous refers to an organism that has two identical alleles for a particular trait.

Front

What does heterozygous mean?

Back

Heterozygous refers to an organism that has two different alleles for a particular trait.

Front

What is the probability of two homozygous red birds (bb) having a blue bird offspring?

Back

0% - They can only produce red offspring.

Front

If one parent is Bb (heterozygous blue) and the other is BB (homozygous blue), what is the probability of having blue offspring?

Back

100% - All offspring will be blue.

Front

What is the probability of two heterozygous tall plants (Tt) producing short offspring?

Back

25% - There is a 25% chance of producing tt (short) offspring.

Front

What is the probability of a heterozygous tall plant (Tt) crossing with a recessive short plant (tt) producing tall offspring?

Back

50% - There is a 50% chance of producing Tt (tall) offspring.

Front

What is the definition of a recessive allele?

Back

A recessive allele is an allele that is masked by the presence of a dominant allele and only expresses its trait when two copies are present.

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present.

Front

How do you determine the genotype of an organism?

Back

The genotype is determined by the alleles inherited from the parents, which can be homozygous or heterozygous.