5. The so-called "blue" (really gray) Andalusian variety of chicken is produced by a crossbetween the black and white varieties, both of which breed true (i.e., both arehomozygous). What color chickens (and in what proportions) would you expect if youcrossed two blues? a blue and a black? (Search in the internet the alleles)6. In four o'clock, red color exhibits incomplete dominance over white; when both existtogether, the flowers are pink.a. In a cross between a red flower and a white one, what is the genotype of theoffspring?b. What is the genotypic ratio of the F2 generation if two of the F1 from (a) are crossed?c. List the genotypes of offspring produced by a cross between the F1 generation and redparent.

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5. The so-called "blue" (really gray) Andalusian variety of chicken is produced by a cross between the black and white varieties, both of which breed true (i.e., both are homozygous). What color chickens (and in what proportions) would you expect if you crossed two blues? a blue and a black? (Search in the internet the alleles)

5. The so-called "blue" (really gray) Andalusian variety of chicken is produced by a cross between the black and white varieties, both of which breed true (i.e., both are homozygous). What color chickens (and in what proportions) would you expect if you crossed two blues? a blue and a black? (Search in the internet the alleles)

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter12: Mendel, Genes, And Inheritance

Section: Chapter Questions

Problem 6TYK

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1. What is the difference between genotype and phenotype? 2. A black guinea pig is mated to a white guinea pig, and they produce 12 black offspring. Then, the same white guinea pig is mated to a different black guinea pig, and they produce 7 black and 5 white offspring. What is the best explanation for the difference between these two matings? In your answer, you must include the genotypes for the parents and offspring of each cross. 3. In 1981, a stray black cat with unusual curled-back ears was adopted by a family in California. Suppose you were the person who owned the first “curl” cat, and wanted to develop it into its own breed. How would you determine whether the allele for curled ears is dominant or recessive? Why does it make a difference for breeders whether an allele for a trait is dominant or recessive?
1. A pure line Brown coat goat is crossed with pure line White coat goat. Consider the Brown coat is dominant over white coat. a. What is the result (F1) of this cross? b. What is the result when 2 F1 hybrid from (a) is crossed? Give the phenotype, genotype and their ratio. Make sure the phenotype and genotype were aligned with its ratio.
8. In certain breeds of dogs, two different sets of alleles determine the color pattern. Black color is dominant and red color is recessive; solid color is dominant and white spotting is recessive. A homozygous black-and-white spotted male is crossed with a red-and-white spotted female. What is the probability of their producing a solid black puppy? Show your work.
4. In analyzing genetic crosses, it is often necessary to examine more than one trait that is inherited in offspring. Mendel derived his Law of independent assortment of alleles by examining two traits at once. You can follow in Mendel's footsteps by working through a slightly more complex cross-a dihybrid cross-in which you can determine the probabilities of how two different traits can manifest in the offspring. Consider the two traits in pea plants that were discussed above-height (T, t) and pea color (Y, y). A dihybrid cross to trace transmission of these alleles into offspring would involve two hybrid parents, which means both of their genotypes would be TtYy. Imagine that you cross these two parents together-what types of offspring could you possibly get? a. What combination of alleles T, t, Y and y would be found in the gametes of a TtYy parent? b. Using the Punnett square below, distribute the maternal gametes onto the vertical axis and the paternal gametes onto the horizontal…
3. Black coat (B) color in Cocker Spaniels is dominant, while red coat (b) color is recessive; solid pattern (S) is dominant, while spotted (s) pattern is recessive. Create a Punnett square that shows all of the possible offspring of a solid black male (BBSs) mated to a solid red female (bbSs). Include the percentage/ratio of occurrence for each phenotype. Include the percentage/ratio of occurrence for each phenotype.
17. Three recessive traits in aardwolf (a real animal) are stripe-less (s), dwarf (d), and fluffy mane (f). A stripe-less and fluffy female aardwolf mates with a dwarf male aardwolf to produce an F1 that is all WT (has stripes, normal size, and non-fluffy mane). When an F1 is test crossed to a fully recessive aardwolf, the following F2 are produced: Stripe-less, fluffy, normal sized 89 Striped, non-fluffy, dwarf 92 Stripe-less, non-fluffy, dwarf 1 Striped, fluffy, normal sized 2 11 13 19 20
4. A male rabbit with genotype GgBb x with a female rabbit with genotype ggbb. ● The female only has one possible combination (gb) and her gametes are completed on the Punnett square below. To set up the Punnett square, use the "foil" method to determine the alleles present in the gametes. The image shown below will help you set up the male rabbit's genotype at the top of the square. ● Show the Punnett square and the expected offspring and their proportions. gb gb G g Bb gb gb How many out of 16 are: Grey, black eyed Grey, red eyed White, black eyed White, red eyed
8. In gerbils, the gene that specifies coat color is sex-linked and has multiple alleles, as follows: B-black, br - brown, by - yellow, and b - albino. The allele br is incompletely dominant over by, the combination br by giving tan color; otherwise, dominance is in the order given -- B, br, by, b. (For your information, gerbils are mammals.) A black gerbil mated with a yellow gerbil gave one brown male and one black female offspring. a. What is the sex of the black parent? b. What is the genotype of the brown offspring? c. If the two offspring were to mate with each other, what is the probability that they will have a yellow offspring? d. If the two offspring were to mate with each other, what is the probability that the first three female offspring will be black? e. If the brown offspring were to mate with his mother, what is the probability that the first two offspring will be brown males?
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 pig, fur color is determined by one gene, and fur length by another independently segregating gene. The black fur allele (B) is dominant to brown fur allele (b) and the short allele (S) is dominant to long fur allele (s). From progeny listed in the following table, provide the probable genotype for the parents of each cross. Phenotype of Progeny Black short black long brown short Parents Black short X Black short Black short X Brown long Black long X Black long 90 17 0 32 16 35 29 14 0 brown long 8 15 2. A mouse with the genotype BbccEeFf is mated with another mouse with BBCCEEFF genotype. What is the probability of obtaining the following genotype in the progeny? a. BBCcEeFF b. BbccEEFf C. BbccEeFF 12 3. Determine the type of gametes that are formed from the following individuals with the given genotype? A. AaBbCc B. AABBCc C. AABbCe
1. If the allelic composition of a gene is Aa, the genotype is said to be (homozygous, heterozygous). What is the probability of having "a" allele in gametes? 2. For a genotype of AaBb, what are the possible allele compositions in gametes? 3. What are the possible genotypes and phenotypes ("A" phenotype or "a" phenotype) in the offspring of a monohybrid cross Aa x Aa? 4. If the organism display a dominant phenotype for a trait ("A" phenotype), how does one determine if the genotype is homozygous or heterozygous? Please use the Punnett square to explain. 5. How many possible genotypes are there in the offspring of a dihybrid cross AaBb x AaBb? What are the possible phenotypes for such a cross? What is the phenotypic ratio for AB : Ab : aB : ab? D Focus 72°F DEA F4 PrtScr Insert Hor F5 F6 F7 F8 F9 F10 F11 F12 24 & 3. 8 E R T Y U
10. In pea plants purple flowers are dominant to white flowers. If two white flowered plants are crossed, what percentage of their offspring will be white flowered? % 11. A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the offspring will have purple flowers? % 12. Two plants, both heterozygous for the gene that controls flower color are crossed. Give the expected RATIOS for each genotype and phenotype. Phenotype Ratio Gentoype Ratio - 13. In guinea pigs, the allele for short hair is dominant over long hair. Two short haired guinea pigs are mated several times. Out of 100 offspring, 25 of them have long hair. What are the probable genotypes of the parents? (Show the cross to prove it!)