Mendel’s law of segregation states that __________.

A man who can roll his tongue and a woman who cannot roll her tongue have a son who can roll his tongue (R = can roll tongue; r = can't roll tongue). The son is curious about whether his father is homozygous or heterozygous for the tongue-rolling trait. Which of the following facts would allow him to know?

Mendel studied __________, heritable features that vary among individuals; each variant is called a __________.

Human ABO groups are best described as an example of __________.

In people with sickle-cell disease, red blood cells break down, clump, and clog the blood vessels. The blood vessels and the broken cells accumulate in the spleen. Among other things this leads to physical weakness, heart failure, joint pain, and brain damage. Such a suite of symptoms can be explained by __________.

Achondroplasia, a type of dwarfism, and Huntington’s disease are examples of __________, with the exception that the Huntington’s allele is __________.

In Labrador retrievers, a dog that has the genotype BBee, where BB produces black-pigmented fur and ee produces yellow-pigmented fur, would have __________ fur and would exhibit __________.

Which choice below is a basic difference between Mendel's particulate hypothesis and the hypothesis of blending inheritance?

In a typical pea experiment, two true-breeding plants with distinct traits of a single character are called the __________, and the offspring are called the __________, which will always be __________.

Fetal cells may be removed along with fluid from the womb by a process known as __________.

A red bull is crossed with a white cow and all of the offspring are roan, an intermediate color that is caused by the presence of both red and white hairs. This is an example of genes that are __________.

In incomplete dominance, the offspring __________.

If a plant variety is true-breeding for a dominant trait, then __________.

In humans, height and skin color have continuous variation in the population because of __________.

An alternative version of a gene is called a(n) __________.

__________ occurs when a single gene affects the phenotype of many characters in an individual.

If the two traits that Mendel looked at in his dihybrid cross of smooth yellow peas with wrinkled green peas had been controlled by genes that were located near each other on the same chromosome, then the F2 generation __________.

Human blood groups are governed by three alleles, A, B, and O. A and B are codominant and O is recessive to both. A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes?

Color in squash is controlled by epistatic interactions in which color is recessive to no color. At the first locus white squash (W) is dominant to colored squash (w). At the second locus yellow (Y) is dominant to green (y). What is the phenotype of a squash with the genotype wwYy?

If a heterozygous plant is allowed to self-pollinate, what proportion of the offspring will also be heterozygous?

The effect of the environment on a phenotype is referred to as __________.

The term “true-breeding plants” means __________.