Genetics - Chapter 4 - BJU Press

Front

What is the term for an organism’s physical appearance of visible traits?

Back

Phenotype

Front

What is it called when two or more genes interact to produce a single trait?

Back

Polygenic inheritance

Front

If straight hair (SS) is dominant, curly hair (CC) is recessive, and wavy hair (SC) is heterozygous, what percentage of children from two wavy-haired parents (SC) will have wavy hair?

Back

50%.

Front

What is the genotype for a heterozygous trait represented by Rr?

Back

Rr

Front

Which genotype represents a homozygous trait?

Back

AA

Front

Define genotype.

Back

The genetic constitution of an individual, represented by alleles.

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed in the phenotype even if only one allele is present, while recessive traits are expressed only when two recessive alleles are present.

Front

What does incomplete dominance mean in genetics?

Back

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

Front

What is the expected phenotype ratio in a monohybrid cross?

Back

3:1 ratio of dominant to recessive phenotypes.

Front

What is a Punnett square used for?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.