Punnett Squares

Front

What is codominance in genetics?

Back

Codominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive. An example is a calico cat showing both orange and black fur.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism (the alleles it carries), while phenotype refers to the observable traits or characteristics of that organism.

Front

If one brother has genotype BB and the other has genotype Bb, what can be said about their phenotypes?

Back

They have the same phenotype (brown eyes) but different genotypes.

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

The probability is 50%.

Front

What does incomplete dominance mean in genetics?

Back

Incomplete dominance is a form of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes.

Front

In the case of a red flowered plant (RR) and a white flowered plant (WW) exhibiting incomplete dominance, what percentage of the offspring will have pink flowers?

Back

100% of the offspring will have pink (RW) flowers.

Front

What is the definition of a dominant allele?

Back

A dominant allele is an allele that expresses its phenotype even in the presence of a recessive allele.

Front

What is the definition of a recessive allele?

Back

A recessive allele is an allele that only expresses its phenotype when two copies are present (homozygous).

Front

In pea plants, if tall (T) is dominant to short (t), what would be the genotype of a homozygous tall plant?

Back

The genotype of a homozygous tall plant would be TT.

Front

What is a Punnett square used for?

Back

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