The Punnett square shows a cross between two heterozygous black guinea pigs (B is black, b is white). What fraction of the offspring in the square are expected to have the genotype bb?

The Punnett square shows a cross between a heterozygous tall pea plant and a short pea plant (T is tall, t is short). What percentage of the offspring in the square are expected to be tall?

A breeder predicts that 75% of the offspring of a cross will have round seeds. Written as a fraction, what portion of the offspring are expected to have round seeds?

A monohybrid cross is predicted to give offspring that are 1/4 homozygous dominant, 1/2 heterozygous and 1/4 homozygous recessive. What is the expected genotype ratio, in that order?

In a corn cross, three out of every four kernels are expected to be colored and one out of every four colorless. Written as a phenotype ratio of colored to colorless, what does this cross predict?

The Punnett square shows a cross between a homozygous dominant parent and a heterozygous parent for fur length (A and a). Read the square: what is the expected genotype ratio of AA to Aa among the offspring?

Two parents who are each heterozygous for a recessive disorder have had three children, none of them affected. What is the probability that their fourth child is affected?

The Punnett square shows the cross for coat color in two guinea pigs (G is black, g is white). This pair has already produced four pups, all black. Read the square: what is the probability that their next pup is white?

A couple has had four daughters. What is the probability that their fifth child is a boy?

Two heterozygous tall pea plants (Tt) are crossed and have already produced three tall offspring. What is the probability that the next offspring is tall?

Two parents who each carry one recessive allele for a disorder have had one affected child. What is the probability that their next child is a heterozygous carrier?

Two pea plants of genotype TtRr are crossed, and the two genes assort independently. What is the probability that an offspring has the genotype ttrr?

In a cross, the parents are Aa x Aa for one gene and Bb x bb for a second gene on a different chromosome. What is the probability that an offspring shows the dominant A phenotype and the recessive b phenotype?

Two plants heterozygous for both flower color and stem height are crossed, and the genes assort independently. What is the probability that an offspring shows the dominant phenotype for both traits?

Two organisms of genotype AaBb are crossed, and the two genes assort independently. What is the probability that an offspring has the genotype AaBb?

A gardener crosses RrYy with Rryy, and the two genes assort independently. What is the probability that an offspring has the genotype rryy?

The Punnett square shows a cross between two heterozygous plants (R and r). The grower raises 80 offspring from this cross. Based on the square, how many are expected to have the genotype rr?

The Punnett square shows a cross between two heterozygous pea plants (Y and y). If 64 offspring are grown from this cross, how many are expected to be heterozygous?

A two-trait cross is expected to produce offspring showing both recessive traits 1/8 of the time. If the cross produces 240 offspring, how many are expected to show both recessive traits?

A cross between two heterozygous plants is expected to give the recessive phenotype in 25% of the offspring. A field contains 320 plants from this cross. How many are expected to show the recessive phenotype?