29. Heredity

An allele that is able to mask the expression of its partner allele is said to be __________.

Codominant alleles are present in __________.

An organism with five pairs of homologous chromosomes could produce __________ different gametes on the basis of independent assortment alone.

The larger the number of offspring, the greater the likelihood that the observed ratios will conform to the values predicted by the Punnett square.

Many genetic disorders, such as albinism, cystic fibrosis, and Tay-Sachs disease, are inherited as simple recessive traits.

The X and Y sex chromosomes are the best examples of homologous chromosomes.

How many chromosomes are in a normal haploid human cell?

In dominant-recessive inheritance, if an individual is heterozygous, which phenotype will be expressed?

The form of inheritance in which the heterozygous state is expressed as an intermediate is __________.

A person who inherits the A and the O blood type alleles will possess which blood type?

What is the probability that a child will be born with a recessive trait if both parents are heterozygous for the trait?

In the human blood type AB, both alleles are expressed and are therefore __________.

If the allele for brown hair is represented by B, it means that __________.

Heterozygous parents who have had one child with a recessive disease have a __________% chance of having a second child born with the same recessive disease.

Use the following information to solve the problem using a Punnett square: Assume that the dominant B allele encodes brown eyes and the recessive b allele encodes blue eyes. An individual with the genotype bb has children with an individual of the genotype Bb. What is the percent chance that they would have children with blue eyes?

Which of the following disorders is NOT inherited as a simple recessive trait?

Linked genes are __________.

Red-green color blindness exhibits __________ inheritance.

X-linked recessive traits are expressed more frequently in males because __________.

Extrachromosomal inheritance involves genes passed on by the mother's __________.

If a male inherits a sex-linked gene for color blindness, __________.

Traits that display continuous phenotypic variation are usually determined by which form of inheritance?

Most human traits are determined by __________.