A plant species has a dominant allele for Purple flowers (P) and a recessive allele for White flowers (p). Two heterozygous plants are crossed. What percentage of their offspring will have White flowers?

Albinism is an autosomal recessive disorder (a). Two parents with normal pigmentation have an albino child. What must the genotypes of the parents be?

In fruit flies, Long wings (L) are dominant to short wings (l). You cross a Long-winged fly with a short-winged fly, and 50% of the offspring have short wings. What is the genotype of the Long-winged parent?

Which of the following represents a homozygous dominant genotype?

If a trait "skips" a generation in a pedigree, it is most likely:

In pea plants, Round seeds (R) are dominant to Wrinkled (r), and Yellow seeds (Y) are dominant to Green (y). A cross is made between RrYy x RrYy. What fraction of offspring will be Wrinkled and Green?

Using the same cross (RrYy x RrYy), what is the phenotypic ratio of the offspring?

In dogs, Black fur (B) is dominant to Brown (b), and Solid coat (S) is dominant to Spotted (s). If you cross a bbss (Brown, Spotted) with a BBSS (Black, Solid), what will all the puppies look like?

A researcher wants to produce offspring that are only homozygous recessive for both traits (aabb). Which cross guarantees this?

In "Four O'Clock" plants, red flowers (RR) crossed with white flowers (WW) produce pink flowers (RW). This is an example of:

If you cross two Pink Four O'Clock flowers (RW x RW), what is the probability of getting a Red flower?

In certain chickens, black feathers (B) are codominant with white feathers (W). Heterozygous chickens (BW) are "ermintte" (black and white speckled). If you cross a Black chicken (BB) with a White chicken (WW), what will the offspring look like?

Referring to the chickens above, if you cross two Erminette chickens (BW x BW), what percentage of offspring will be White (WW)?

A woman with Type O blood (ii) marries a man with Type AB blood (I^A I^B). What is the probability they will have a child with Type O blood?

A father is heterozygous for Type A blood (I^Ai) and the mother is heterozygous for Type B blood (I^Bi). What possible blood types can their children have?

Which blood type is considered the "Universal Donor" because it has no antigens?

If a child has Type AB blood, which set of parents COULD NOT produce this child?

Hemophilia is an X-linked recessive disorder (X^h). A carrier mother (X^H X^h) has children with a normal father (X^H Y). What is the chance their son will have hemophilia?

Why are sex-linked recessive traits (like colorblindness) more common in males than females?

What is the genotype of a female who is a carrier for colorblindness?

In a pedigree, a shaded circle represents:

If two unaffected parents have an affected daughter, the mode of inheritance for the trait is likely:

In a sex-linked recessive pedigree, who usually passes the trait to an affected son?

The physical appearance of an organism (e.g., "Tall") is its:

An organism with two different alleles for a trait (Tt) is called:

Which law states that alleles for different traits (like seed shape and seed color) are distributed to sex cells independently of one another?

A variation of a gene (e.g., B or b) is called a(n):

In tomatoes, Red fruit (R) is dominant to Yellow fruit (r). A farmer crosses a RR plant with a rr plant. What is the genotype of the F1 offspring?

In the cross from question 29, what is the phenotype of the F1 offspring?

Cystic Fibrosis is a recessive disorder (f). A normal couple has a child with Cystic Fibrosis. What is the probability their next child will be normal (not have the disease)?

A man with Type A blood (I^A I^A) has a child with a woman with Type AB blood (I^A I^B). Can they have a child with Type B blood?

In cattle, Red hair (R) and White hair (W) are codominant. Heterozygotes (RW) are Roan (red and white hairs). Cross a Roan cow with a Roan bull. What percentage of calves will be White?

In a dihybrid cross of AABB x aabb, how many different phenotypes appear in the F1 generation?

Which of the following is an example of a gamete genotype?

Sex-linked traits are located on which chromosome?

If a woman is colorblind (X^c X^c), what percentage of her sons will be colorblind?

Mendel's finding that two factors for a trait separate during gamete formation is known as:

Two heterozygous parents for a dominant trait (Huntington's disease, H) have a child. (Hh x Hh). What is the chance the child is healthy (does NOT have the dominant disease)?