B6F In cattle the allele for cloven hooves (H) is dominant over the allele for mule-foot hooves (h ). The phenotype for each trait is shown in this picture.

What is the probability of cloven hooves in the offspring of parents that are heterozygous for the trait?

B6F Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?

B6F In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p) . What is the expected phenotypic ratio of the offspring of a BbPp x BbPp cross if these alleles

sort independently?

B6F The four butterflies in the illustrations represent the offspring in the F₁ generation.

Which statement is best supported by the phenotypes of these offspring?

B6F Chickens can have different types of feathers. Frizzled feathers curl toward a chicken's head . Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?

B6F Facial dimples and free earlobes are both considered dominant human traits. What are the expected phenotypes of the offspring of a female with dimples and free earlobes (DDFf) and a male with no dimples and attached earlobes (ddff)?

B6F Normal fruit flies have brownish-yellow bodies, and this body color is dominant. A mutation in the gene for body color can produce flies with an ebony body color. A homozygous normal fruit fly (e+e+) is crossed with a homozygous ebony fruit fly (ee). What is the predicted

outcome of this genetic cross?

B6F In the 1860s Gregor Mendel performed numerous dihybrid crosses between pea plants. Dihybrid crosses involve the study of the inheritance patterns related to two different traits. In guinea pigs the allele for black fur (B) is dominant over the allele for brown fur (b), and the allele for short fur (F) is dominant over the allele for long fur ( f ). What percentage of the offspring from a BbFf x bbff cross would be expected to be heterozygous for both traits?

B6F Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this t ra it. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous forhairy stems?

If several pea plants with the genotype TTYy are crossed with pea plants with the genotype Ttyy, what percentage of the offspring will be expected to have the TTYy allele combination?

B6F In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic ratios can be expected?