Please explain You are interested in the inheritance of two autosomal genes in a type of beetle. These genes determine carapace color (violet or green, governed by the alleles c+ and c) and presence or absence of a horn (with horn, without horn, determined by the alleles h+ and h). You cross two pure lines of beetles and let the F1 generation (c+/c · h+/h) intercross. The F2 progeny deviate from the expected Mendelian ratio, so you cross a dihybrid F1 female with a tester male. Of the 500 progeny, 132 are (c+ · h+), _____ are (c · h), 118 are (c · h+), and 110 are (c+ · h).
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- Three genes in fruit flies affect a particular trait, and at least one dominant allele of each gene is necessary to get a wild-type phenotype. a. What phenotypic ratio would you predict among the progeny if you crossed triply heterozygous flies? b. You cross a particular wild-type male in succession with three tester strains. In the cross with one tester strain (AA bb cc), only 1/4 of the progeny are wild type. In the crosses involving the other two tester strains (aa BB cc and aa bb CC), half of the progeny are wild type. What is the genotype of the wild-type male? (Pls help asap!!)Polydactylism (extra digits) is due to a dominant autosomal allele, what is the likelihood that a couple with the normal number of digits have a son with polydactylism? Flower color in snapdragons is due to a gene with incomplete dominance: CRCR plants have red flowers, CRCW have pink flowers, and CWCW plants have white flowers. Which cross is expected to yield progeny that all have pink flowers? A couple is expressing a child, the man has hemophilia (a sex-linked blood disorder due to a recessive allele) and the woman is a carrier for this disorder. If they have a daughter, what is the likelihood that she will inherit hemophilia?The pedigree above shows inheritance of inability to taste PTC (shaded individuals cannot taste it), which is caused by mutation in a single gene. What is the probability that III-3 and III-4 will have a child who is heterozygous? 1 1/3 1/9 4/9 1/4 3/4 1/2 2/3 1/16
- 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.The recessive allele s causes Drosophila to have small wings, and the s+ allele causes normal wings. This gene is known to be X linked. If a small-winged male is crossed with a homozygous wild-type female, what ratio of normal to small-winged flies can be expected in each sex in the F1? If F1 flies are intercrossed, what F2 progeny ratios are expected? What progeny ratios are predicted if F1 females are backcrossed with their father?You are studying tail length in a species of mice, where some mice have long tails and some have short tails.Preliminary results show that long tail is dominant, but you think the trait may be X-linked. Give the expectedoffspring phenotypic ratio for each cross if the trait is X- linked or if it is autosomal and answer the question atthe end. Make sure your phenotypic ratio is labeled with the complete phenotype (all relevant details). Cross #1: true-breeding long-tailed male x true-breeding short tailed female• Expectation if X-linked?• Expectation if autosomal?Cross #2: true-breeding long-tailed female x true-breeding short tailed male• Expectation if X-linked?• Expectation if autosomal?Compare the four results listed above. Briefly, why is a reciprocal cross is necessary to determine X (or Z)linkage?
- In certain cactus, prickly spines can be two-pronged or one-pronged. If a homozygous one-pronged cactus is crossed with a homozygous two-pronged cactus, the F1 generation has a mixture of spines (some are two-pronged, some are one-pronged). a. What are the genotypes of the parents and F1s?b. What mode of inheritance is exhibited? c. If the F1s were crossed, what proportion of the F2s will have genotypes like their parents?A rooster with a particular comb morphology calledwalnut was crossed to a hen with a type of comb morphology known as single. The F1 progeny all had walnut combs. When F1 males and females were crossedto each other, 93 walnut and 11 single combs wereseen among the F2 progeny, but there were also29 birds with a new kind of comb called rose and32 birds with another new comb type called pea.a. Explain how comb morphology is inherited.b. What progeny would result from crossing a homozygous rose-combed hen with a homozygouspea-combed rooster? What phenotypes and ratioswould be seen in the F2 progeny?c. A particular walnut rooster was crossed to a peahen, and the progeny consisted of 12 walnut,11 pea, 3 rose, and 4 single chickens. What are thelikely genotypes of the parents?d. A different walnut rooster was crossed to a rosehen, and all the progeny were walnut. What are thepossible genotypes of the parents?You have a Drosophila line that is homozygous for autosomal recessive alleles a, b, and c, linked in that order. Youcross females of this line with males homozygous for thecorresponding wild-type alleles. You then cross the F1 heterozygous males with their heterozygous sisters. You obtain the following F2 phenotypes (where letters denoterecessive phenotypes and pluses denote wild-type phenotypes): 1364 + + +, 365 a b c, 87 a b +, 84 + + c,47 a + +, 44 + b c, 5 a + c, and 4 + b +.a. What is the recombinant frequency between a andb? Between b and c? (Remember, there is no crossingover in Drosophila males.)b. What is the coefficient of coincidence?
- In mice, albinism (g) is recessive to grey coat colour (G). A grey mouse mated with an albino mouse. Over the course of several months, 38 pups were born. Out of 38 pups, 17 had a grey coat, and 21 were albino. Theoretically, what is the expected result from the parental cross of a grey mouse and an albino mouse, and why does the expected result not match the result stated in the information given above? Select one: a. Theoretically, there should be a 3:1 ratio of grey mice to albino mice, or 29 grey coat mice and 9 albino mice. With more litters, the actual results would match the expected results more closely. b. Theoretically, there should be a 1:1 ratio of grey mice to albino mice, or 19 grey coat mice and 19 albino mice. With more litters, the actual results would match the expected results more closely. c. Theoretically, 100% of the mice should have grey coats so all 38 offspring should have grey coats. There was an experimental error that can account for the deviation. d.…In Drosophila, white eyes (w) are recessive to red eyes (w+) at one locus and black body (b) is recessive to gray body (b+). A homozygous white eyes, gray bodied female is crossed with a homozygous red eyes, black bodied male to produce the F1 progeny. The F1 progeny are testcrossed and produce the following progeny: White eyes, black body: 212 White eyes, gray body: 288 Red eyes, black body: 308 Red eyes, gray body: 192 Does the evidence indicate that w and b loci are linked? Explain why or why not? If they are linked, what is the map distance between the two loci? If they are not linked, what is the map distance between the two loci? If they are linked, are the allels in the F1 in coupling or repulsion? How do you know? Draw the genotypes of all individuals described in the problem (original parents, F1, testcross, and F2 progeny) using the appropriate notation.Drosophila eye color is determined by a single gene. Supposed you collect a population of drosophila and note that some flies have white eyes and some flies have red eyes. A red eyed male mates with a female red eye to get the following progeny: 75 red eyed females 35 red eyed males 38 white eyed males A. Specifically, what inheritance pattern can explain these results? B. What must be the genotype of the two red eyed flies that mated in your cross?