5. The Merle (M) gene affects coat color in dogs. MM Dogs are totally white, Mm Dogs have white spots mixed with the base color of the dog, and mm dogs have no spots. You cross 2 Mm dogs. What are the expected genotypes and phenotypes of the offspring? Give the expected ratios.
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Question 5
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- Imagine you are performing a cross involving seed color in garden pea plants. What Fi offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. 100 percent yellow-green seeds 100 percent yellow seeds 50 percent yellow, 50 percent green seeds 25 percent green, 75 percent yellow seedsA true-breeding rabbit with agouti (mottled, grayish brown) fur crossed with a true-breeding rabbit with chinchilla (silver) fur produces all agouti offspring. A true-breeding chinchilla rabbit crossed with a true-breeding Himalayan rabbit (white fur with pigmented nose, ears, tail, and legs) produces all chinchilla offspring. A true-breeding Himalayan rabbit crossed with a true-breeding albino rabbit produces all Himalayan offspring. Explain the inheritance of the fur colors.3. Short-tailed pup distribution. In mice, the dominant T allele results in a short tail. Homozygous T/T genotype is lethal, which means mouse embryos with this genotype die before they are born. Homozygous t/t is normal, with normal tail. A cross between two short-tailed mice produces a litter of 5 pups. a). What are the genotype(s) of the two short-tailed mice used in the cross? b). What are the possible genotypes and phenotypes of the 5 pups? What are their perspective ratio?
- 1. In pea plants, yellow color (Y) is dominant over green color (y). A yellow-colored pea plant is crossed with a green-colored pea plant. Half of their offspring is yellow-colored while the other half is green-colored.What is the genotype of the yellow-colored parent? YY O Yy yy The genotype cannot be determined. 2. A scientist discovered an unknown organism in a tropical rainforest. The organism has been identified to possess the following characteristics: (1) multicellular at some point of its life cycle; (2) feeds on decaying organic matter; and (3) has a cell wall made of chitin.Which Kingdom does the unknown organism likely belong to? Kingdom Animalia Kingdom Plantae Kingdom Fungi Kingdom Protista 3. Which statement about ferns is TRUE? Ferns are unicellular organisms. Ferns are nonvascular plants. O Ferns have spores as reproductive structures. Ferns are capable of secondary growth.4. The ruffed chicken has an under-chin wattle. A smooth wattle (S) is dominant over a wrinkled wattle (s). A red wattle (HR) is incompletely dominant with a white wattle (HW) so that an individual with HRHW will have a pink wattle. A chicken with a wrinkled red wattle is mated to a homozygous chicken with a smooth white wattle. What is the genotype and phenotype of the chicks?5. In cattle, roan color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. When two roan cattle are crossed, the phenotypes of the offspring are found to be in the ratio of 1 red: 2 roan: 1 white. a) What cross could produce the highest percentage of roan cattle? b) How would one produce a herd of pure-breeding roan-color cattle? Explain
- 1. In guinea pigs, two different genes affect the coat. One gene codes for coat color and there are 2 codominant alleles C1=Brown and C2=White. The heterozygous form is tan colored. The second gene codes for presence of hair with H=hairy (dominant) and h=hairless (recessive). If we didn't know the genotypes of the parents, but mom is hairless and dad is tan haired, and the babies produced included brown, tan, white, and hairless, can you guess the genotypes of the parents? Show your work below (explain how you came up with the answers)4. In dogs, the gene for fur color has two alleles. The dominant allele (F) codes for GREY fur. The recessive allele (f) codes for black fur. 1) Create a Punnett square for the crossing of a Heterozygous male dog and a female dog with black fur. 2) What is the probability that the offspring will have black fur? Grey fur?3. When a guinea pig with polydactyly is mated with a guinea pig that has normal feet, one half of the offspring have polydactyly and one half have normal feet. If two guinea pigs with polydactyly are mated, 1/3 of the offspring have normal feet and 2/3 have polydactyly. Explain the inheritance pattern for both crosses.
- 3. In cats, agouti coat (uneven colored fur) is dominant to a solid coat. Brown coat color is dominant to chocolate color coat. Solid brown fur Agouti fur Solid fur Chocolate colored fur pattern pattern An agouti cat http://www.eurocatfancy.de/en1/nav/cat-genetics/dominance_of_genes.html Cross a cat that is heterozygous agouti and chocolate colored with a cat with a solid coat and is heterozygous brown. a. What percentage of the offspring is agouti and brown? b. What percentage of the offspring is solid and chocolate?9. In fruit flies, the gene for tan body color (T) is completely dominant over the gene for ebony body color (t). The gene for red eyes is dominant over the gene for white eyes and is a sex-linked trait. A tan female with red eyes (heterozygous for both traits) is crossed with a homozygous ebony male with white eyes. A) Write out the genotypes of two parents. Remember that eye color is sex- linked! Female: Male: B) Set up and fill out a punnett square for this cross. C) What is the probability of producing a fly that is an ebony male with white eyes?7. In pea plants, the dominant allele for flower color is yellow (Y), and the recessive allele is white (y). If a homozygous dominant (YY) yellow-flowered plant is crossed with a heterozygous (Yy) yellow flowered plant what will be the possible genotypes and phenotypes of the offspring? Possible genotypes: Possible phenotypes:
