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Two gray mice with unknown ancestry are crossed. Can you determine from the
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- In guinea pigs, rough coat (R) is dominant to smooth coat (r). If a homozygous rough-coated animal is crossed with a smooth-coated one: What will be the phenotype(s) of the F1 generation? What will be the phenotype(s) of the F2 generation? What will be the phenotype(s) of the offspring resulting from a cross of an F1 individual back to its rough parent? What will be the phenotype(s) of the offspring of a cross of an F1 individual back to its smooth parent?In a cross between a black and a white cat, all members of the Fi generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white cat. (i) Diagram this cross, showing the genotypes and phenotypes of the parents, F, and F2 generations. What is the probability that the first two offspring will be homozygous and the third is white if an Ficat is test crossed?In the snail Limnaea peregra, coiling of the shell is determined by the genes D for right-hand coiled shells, and d for left-hand coiled shells. The gene for the right-hand coiled shell is dominant. The direction of coiling is determined by the genotype of the maternal parent producing the egg, regardless of the progeny's genotype. Which of the following crosses could give a left-hand coiled shell heterozygote? A. right-hand coiled dd female X left-hand coiled DD male B. left-hand coiled DD female X right-hand coiled dd male C. left-hand coiled DD female X left-hand coiled DD male D. right-hand coiled dd female X left-hand coiled dd male
- In cats, S = short hair; s = long hair; XC = black coat; Xc = yellow coat; XCXc = tortoiseshell (calico) coat. If a long-haired yellow male is crossed with a tortoiseshell female homozygous for short hair, what are the expected phenotypic results?A wild-type male and a wild-type female Drosophila with red eyes and full wings are crossed. Their progeny are shown below: Males Females 3/8 Full wing, Red eye ¾ Full wing, Red eye 3/8 Miniature wing, Red eye ¼ Full wing, Purple eye 1/8 Full wing, Purple eye 1/8 Miniature wing, Purple eye 1. What is/are the genotype(s) of females with purple eye? Of males with purple eye and miniature wing? Draw both out with appropriate symbolsAssume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus. a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes? b) What is the probability of the parental aabbRR genotype in the F2 progeny? c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?
- In dogs, black coat color (B) is dominant to yellow coat color (b), and straight fur (C) is dominant to curly fur (c). The coat color gene and the fur texture gene are on different chromosomes, so they assort independently, and are not sex-linked. In a cross between two BbCc parents, given that an offspring has black coat color and straight fur, what's the probability that it is heterozygous for both genes? Give 2 digits past the decimals.Consider this cross in pea plants: Tt Rr yy Aa × Tt rr Yy Aa, whereT = tall, t = dwarf, R = round, r = wrinkled, Y = yellow, y = green,A = axial, a = terminal. What is the expected phenotypic outcomeof this cross? Have one group of students solve this problem bymaking one big Punnett square, and have another group solve it bymaking four single-gene Punnett squares and using the multiplication method. Time each other to see who gets done first.In currant moths, their Light color is sex-linked and recessive (d) to dark color (D). Question: What are the genotype and the phenotype of the parents if a certain cross yields ½ dark and ½ light colored females and all dark males? Take note that female moths are heterogametic.
- In rabbits, the homozygous CC is normal, Cc results in very long legs, and cc results in very short legs. The genotype BB produces black fur, Bb brown fur, and bb white fur. Assume the leg gene and fur colour gene described above are on different chromosomes. If a cross is made between brown rabbits with very long legs and white rabbits with very long legs, what percentage of the offspring would be expected to have very long legs and white fur? Select one: O a. 25% O b. 50% О с. 100% O d. 75%A cross was made between a black male dog and two different white females. The first female gave birth to eight white pups, and the second female gave birth to two white and three black pups. What are the likely genotypes of the male parent and the two female parents?You are doing a cross with Drosophila using the following two traits. Curly wings is dominant over straight wings, and round eyes is dominant over elliptical eyes. You cross a female fly that is known to be heterozygous for both genes with a male that is heterozygous for the wing gene but has elliptical eyes. This cross produces 74 flies with curly wings and round eyes, 61 with curly wings and elliptical eyes, 24 with straight wings and round eyes, and 21 with straight wing and elliptical eyes. Calculate the expected phenotype ratios for this cross, then use the chi-square test to see if the observed data are consistent with the expected numbers.