Concept explainers
In chickens, the presence of feathers on the legs is due to a dominant allele (F), and the absence of leg feath-ers is due to a recessive allele (f). The comb on the top of the head can be either pea-shaped, a
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
Genetic Analysis: An Integrated Approach (2nd Edition)
- Two genes, U and H, affect wing development in a species of flying pigs, where some pigs have wings and some do not. Only pigs with the genotype uuhh have wings; pigs of any other genotype do not have wings. Which of the following best describes this scenario? Dominant epistasis of U over H Duplicate dominant epistasis Dominant epistasis of H over U Recessive epistasis of H over U Recessive epistasis of U over H Duplicate recessive epistasisarrow_forwardIn rabbits, the color of body fat is controlled by a single genewith two alleles, designated Y and y. The outcome of this traitis affected by the diet of the rabbit. When raised on a standardvegetarian diet, the dominant Y allele confers white body fat,and the y allele confers yellow body fat. However, when raisedon a xanthophyll-free diet, a homozygote yy rabbit has whitebody fat. If a heterozygous rabbit is crossed to a rabbit withyellow body fat, what are the proportions of offspring withwhite and yellow body fat when raised on a standard vegetariandiet? How do the proportions change if the offspring are raisedon a xanthophyll-free diet?arrow_forwardIn rabbits, black hair depends on a dominant allele, B, and brown hair on a recessive allele, b. short hair is due to a dominant allele, S, and long hair to a recessive allele, s. If a true-breeding black short-haired male is mated with a brown long-haired female, describe their offspring. What will be the genotypes of the offspring? If two of these f1 rabbits are mated, what phenotypes would you expect among their offspring? In what proportions?arrow_forward
- In genetics, the dash symbol (–) is a “wild card” that stands for either the dominant allele or the recessive allele; for example, A– means the individual has either the genotype AA or Aa. Two genes that undergo independent assortment affect coat color in Duroc pigs. Each gene has two alleles, one of which is dominant for coat color. Genotypes of the form A– B– are red, those of the form A– bb and aa B– are sandy, and genotype aa bb is white. What ratio of red:sandy:white is expected from the cross Aa Bb x Aa Bb?arrow_forwardIn humans, hair color and structure are determined by two independent pairs of genes. The dominant gene T determines dark hair color, and the recessive allele t - light hair; The dominant gene S determines the formation of curly hair, and its recessive allele t - straight hair. What kind of hair will the children have if the mother has light, straight hair, and the father has dark, curly hair (one of the pairs of traits is heterozygous for both parents)?arrow_forwardIn poultry, two independently assorting genes together determine the structure of the comb. Thus, when R is the only dominant allele present, the fowl possesses a rose comb; when P is only dominant allele present, a ‘pea’ comb is produced; when both dominants are present, a ‘walnut’ comb is produced; when only the recessive alleles are present, a ‘single’ comb is obtained. (a) What are the possible genotypes of all the phenotypes obtainable? Determine the genotype of the parent birds in the following crosses: (b) Rose x walnut produced 3/8 walnut, 3/8 rose, 1/8 rose, 1/8 pea and 1/8 single offspring. (c) Walnut x single produced ¼ walnut and ¼ pea, ¼ rose and ¼ single offspring (d) Rose x pea produced 6 walnut and 5 rose offspring.arrow_forward
- In the hypothetical Spring Songbird, golden (G) is a Z-linked gene that controls wing color. The wild-type allele (G+), which codes for orange feathers, is completely dominant to the mutant allele (G), which codes for golden feathers. A male Spring Songbird with orange feathers could have which of the following genotypes? Z(G+) Z(G) ZIG+) W Z(G) Z(G) more than one of the answers listed here is correct ZIG) W Z(G+) Z(G+)arrow_forwardAssume that hair color, hair line, and skin tone in humans are different traits that are controlled by independently-assorting genes. Brown hair (B) is dominant to blond hair (b), a widow’s peak (W) is dominant to a straight hairline (w), and freckles (F) are dominant to no freckles (f). What is the likelihood that the child of a BBWwff person and a bbwwFF person will have: brown hair, a widow’s peak, and freckles? There is no missing information, just have to set up the punet square and I'm not sure how to do all traits.arrow_forwardIn guinea pigs, rough coat is dominant (R) to smooth coat (r), and black coat (B) is dominant to white coat 9. (b). A rough black guinea pig bred with a rough white one produces 29 rough black offspring, 31 rough white offspring, 11 smooth black offspring, and 9 smooth white offspring. Give the genotypes of the parents, the probability for the offspring, and the actual number of each kind of offspring you would expect. Genotype of the rough, black parent? Genotype of the rough, white parent? Genotypes Phenotypes What is the probability of getting rough, black offspring? What is the probability of getting rough, white offspring? What is the probability of getting smooth, black offspring? What is the probability of getting smooth, white offspring? Of the 80 offspring that were produced, we might have expected how many of them to be rough and black? Of the 80 offspring that were produced, we might have expected how many of them to be rough and white? Of the 80 offspring that were…arrow_forward
- Suppose two independently assorting genes are involved in the pathway that determines fruit color in squash. These genes interact with each other to produce the squash colors seen in the grocery store. At the first locus, the W allele codes for a dominant white phenotype, whereas the w allele codes for a colored squash. At the second locus, the allele Y codes for a dominant yellow phenotype, and the allele y codes for a recessive green phenotype. The phenotypes from the first locus will always mask the phenotype produced by the second locus if the dominant allele (W) is present at the first locus. This masking pattern is known as dominant epistasis. A dihybrid squash, Ww Yy, is selfed and produces 160160 offspring. How many offspring are expected to have the white, yellow, and green phenotypes?arrow_forwardTwo genes, U and H, affect wing development in a species of flying pigs, where some pigs have wings and some do not. Pigs with wings are always homozygous at gene U (U1U1). Among pigs with wings, allele H4 codes for grey feathers and is dominant over allele H5, which codes for white feathers. Which of the following best describes this scenario? Group of answer choices 1.Recessive epistasis of U over H 2.Dominant epistasis of H over U 3.Duplicate Recessive Epistasis 4.Dominant epistasis of U over H 5.Duplicate Dominant Epistasis 6.Recessive epistasis of H over Uarrow_forwardEye Color is a trait that involves a number of genes. To simplify our example, we can break down the traitinto two phenotypes: dark color and light color eyes. Dark coloration is considered dominant, or isexpressed in a heterozygous condition (when the alleles are different).Q: If you have one light eyed parent and one parent that is homozygous for dark eye color, what are thepotential eye colors of their offspring (young)? To start, what do the Parents’ alleles look like? What istheir Genotype? (Remember, you pick which letter you want to use)Light eye colored parent:Dark eye colored parent:One of the things Mendel designed was a way to provide information about how the genes are passed onfrom parent to offspring. He designed something called a Punnett Square. This square places the parents’alleles outside the box, then uses those alleles to fill in the squares.Let’s start with a reminder of what we know about the parents: Parent Phenotype(appearance) Genotype(alleles) 1 2arrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education