Please help me im so confused. a. Which is the homogametic sex in humans? ii. the heterogametic sex in humans? b.) Which is the homogametic sex in these moths? ii.) the heterogametic sex in these moths? Support your answers in part c by analyzing the two crosses shown above. PLEASE DEFINE YOUR SYMBOLS and show your work clearly.
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Please help me im so confused.
a. Which is the homogametic sex in humans?
ii. the heterogametic sex in humans?
b.) Which is the homogametic sex in these moths?
ii.) the heterogametic sex in these moths?
Support your answers in part c by analyzing the two crosses shown above. PLEASE
DEFINE YOUR SYMBOLS and show your work clearly.
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- A wild-type fruit fly (heterozygous for gray body color andred eyes) is mated with a black fruit fly with purple eyes. Theoffspring are wild-type, 721; black purple, 751; gray purple, 49;black red, 45. What is the recombination frequency betweenthese genes for body color and eye color? Using informationfrom problem 3, what fruit flies (genotypes and phenotypes)would you mate to determine the order of the body color, wingsize, and eye color genes on the chromosome?A series of crosses were performed between pure breeding lines of mice with different coat colours. white agouti white agouti ВВсcDD bbCCdd bbccDD bbCCdd black brown BbCcDd bbCcDd white agouti white agouti ВВсcdd bbCCdd bbccdd bbCCdd gray agouti BbCcdd bbCcdd A) Based on the results of the crosses, describe the type of gene interaction that gives the white phenotype. Explain your reasoning. B) Determine the order of the function.In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele for red flowers (p). An allele for long pollen grains (L) is dominant when paired with a recessive allele for round pollen grain (l). Bateson and Punnett crossed a plant having purple flowers/long pollen grains with one having white/flowers/round pollen grains. All F1 offspring had purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple flowers/round pollen grains 27 red flowers/long pollen grains 85 red flowers/round pollen grains What is the best explanation for these results?
- Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?Red eyes is the wild-type phenotype in Drosophila, and severaldifferent genes (with each gene existing in two or more alleles) affect eye color. One allele causes purple eyes, and a different allelecauses vermilion eyes. The purple and vermilion alleles are recessive to red eye color. Two types of crosses provided thefollowing data:Cross 1: Males with vermilion eyes × females with purple eyes354 offspring, all with red eyesCross 2: Males with purple eyes × females with vermilion eyes212 male offspring with vermilion eyes221 female offspring with red eyesExplain the pattern of inheritance based on these results. Whatadditional crosses might you make to confirm your hypothesis?For each of the terms in the left column, choose thebest matching phrase in the right column.a. epistasis 1. one gene affecting more than onephenotypeb. modifier genes 2. the alleles of one gene mask theeffects of alleles of another genec. conditional lethal 3. both parental phenotypes areexpressed in the F1 hybridsd. permissive condition 4. a heritable change in a genee. reduced penetrance 5. genes whose alleles alterphenotypes produced by theaction of other genesf. multifactorial trait 6. less than 100% of the individualspossessing a particular genotypeexpress it in their phenotypeg. incomplete 7. environmental condition thatdominance allows conditional lethals tolive
- The distance between two molecular markers that are linked alongthe same chromosome can be determined by analyzing the outcomesof crosses. This can be done in humans by analyzing a family’spedigree. However, the accuracy of linkage mapping in humanpedigrees is fairly limited because the number of people in mostfamilies is relatively small. As an alternative, researchers cananalyze a population of sperm, produced from a single male, andcompute linkage distance in this manner. As an example, let’ssuppose a male is heterozygous for two polymorphic STSs. STS-1exists in two sizes: 234 bp and 198 bp. STS-2 also exists in twosizes: 423 bp and 322 bp. A sample of sperm was collected fromthis man, and individual sperm were placed into 40 separate tubes.In other words, there was one sperm in each tube. Believe it or not,PCR is sensitive enough to allow analysis of DNA in a single sperm!Into each of the 40 tubes were added the primers that amplify STS-1and STS-2, and then the samples were…Coat color in mice is influenced by two genes, one for color (A) and one for the amount of pigment production (C). Mice with the wild type agouti coat color have a yellowish to brownish color. Mice also have a gene that determines the amount of pigment the hair produces. Mouse Coat Phenotype and Genotype Correlation Agouti coat AA, Aa Solid gray/black coat aa Pigment production CC, Cc Albinism cc Multiple crosses were made between male and female mice that were each heterozygous for both traits (AaCc). The data table shows the number of mice of each coat type. Calculate the average F1 generation coat color to answer the question. Coat Color Number of Mice Born in Each Trial Cross Mean Number of Mice 1 2 3 4 5 6 7 8 9 10 Agouti coat 11 8 9 9 10 8 10 7 10 9 Solid gray/black coat 5 2 1 3 4 3 4 3 3 2 Albinism 3 3 6 4 4 3 3 7 4 3 Which…A pure-breeding strain of squash that produced diskshaped fruits (see the accompanying illustration) wascrossed with a pure-breeding strain having long fruits.The F1 had disk fruits, but the F2 showed a new phenotype, sphere, and was composed of the followingproportions:Longlong 32 sphere 178 disk 270Sphere DiskPropose an explanation for these results, and showthe genotypes of the P, F1, and F2 generations.
- Explain why the percentage of recombinant offspring in a testcrossis a more accurate measure of map distance when two genes areclose together. When two genes are far apart, is the percentage ofrecombinant offspring an underestimate or overestimate of theactual map distance?. As we learned in this chapter, the white mutation ofDrosophila studied by Thomas Hunt Morgan isX-linked and recessive to wild type. When truebreeding white-eyed males carrying this mutationwere crossed with true-breeding purple-eyed females,all the F1 progeny had wild-type (red) eyes. When theF1 progeny were intercrossed, the F2 progeny emergedin the ratio 3/8 wild-type females: 1/4 white-eyedmales: 3/16 wild-type males: 1/8 purple-eyed females:1/16 purple-eyed males.a. Formulate a hypothesis to explain the inheritanceof these eye colors.b. Predict the F1 and F2 progeny if the parental crosswas reversed (that is, if the parental cross wasbetween true-breeding white-eyed females andtrue-breeding purple-eyed males).A recessive allele in mice results in an unusually long neck. Sometimes,during early embryonic development, the long neck causesthe embryo to die. An experimenter began with a population oftrue-breeding mice with normal necks and true-breeding mice withlong necks. Crosses were made between these two populations toproduce an F1 generation of mice with normal necks. The F1 micewere then mated to each other to obtain an F2 generation. For themice that were born alive, the following data were obtained:522 mice with normal necks62 mice with long necksWhat percentage of homozygous mice (that would have had longnecks if they had survived) died during embryonic development?