Two or more forms of a gene that occur at the same locus on homologous chromosomes are called _____________________. 

Lethal dominant alleles are more common than lethal recessive alleles.

The Protenor mode of sex determination is the ________.

Radishes may be long (S1S1), round (S2S2), or oval (S1S2).  If long radishes are crossed with round radishes and the F1 are allowed to cross with each other, the expected F2 phenotypic ratio will be ___.

Assume that a cross is made between AaBb and aabb plants and the offspring occur in the  following numbers:  106 AaBb,  48 Aabb,   52 aaBb,  94 aabb.  These results are consistent with which of the following?

Each sperm cell of a horse contains 32 chromosomes. How many chromosomes are in each of the horse’s somatic (body) cells? 

Crossover frequencies for two-point testcrosses are shown below.    Which gene is in the middle?                   jvl and fl: 3%              jvl and e: 13%             fl and e: 11%.   

One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?

A couple believes that they have brought the wrong baby home from the hospital. The wife and husband are both A+. The child is 0−. Could the child be theirs? Plus and minus refer to the Rh factor. Assume Rh is inherited as a simple dominant so that D_ = + and dd = −.

1) Genetic maps are created using the frequency of crossing over between two linked  genes.  2) If two genes are linked, the two genes are on the same chromosome.