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List the three questions asked to analyze a human pedigree.
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- Describe three different pedigree symbols and their uses. What are pedigrees used for in genetics?Given the pedigree below, answer the questions that follow: a.) Give the appropriate Genotypes.An organism of the genotype AaBbCc was testcrossed to a triply recessive organism (aabbcc). The genotypes of the progeny are presented in the following table. 20 AaBbCc 20 AaBbcc 20 aabbCc 20 aabbcc 5 AabbCc 5 Aabbcc 5 aaBbCc 5 aaBbcc (a) If these three genes were all assorting independently, how many genotypic and phenotypic classes would result in the offspring, and in what proportion, assuming simple dominance and recessiveness in each gene pair? (b) Answer part (a) again, assuming the three genes are so tightly linked on a single chromosome that no crossover gametes were recovered in the sample of offspring. (c) What can you conclude from the actual data about the location of the three genes in relation to one another?
- Congenital hypertrichosis (CH) is a very rare X-linked dominant inherited condition. CH is characterized by the growth of dark hair over the body. CH is so rare, only 50 cases have been identified since the Middle Ages. The incidence of this condition is considerably higher in a small Mexican village (from which the partial pedigree below is derived) than the rest of the human population. I II III Use the following information to answer the two questions. IV D II-4 8 9 IV-6 0=10~ 11 1. Using appropriate nomenclature, identify the genotypes for the following 2 individuals: 12 13 your response must include an appropriate legend/key to identify allele symbols. 2. Show how a Punnett square (using the allele symbols from the previous question) is used to determine the probability in percent of individuals III-11 and III-12 next offspring has CH?The pedigree shown below was obtained for a rare kidney disease. Determine the mode of inheritance for this condition and state your reasoning for your answer.Phenylketonuria (PKU) is a disorder caused by a recessive allele. Two carrier individuals have progeny. Answer the following questions in order and show solutions whenever relevant. a. Indicate the gene notation.b. Derive the expected genotypic and phenotypic ratios.c. If they have a normal child, what is the probability that he or she will be heterozygous?d. If they have three children, what is the probability of having 2 affected children and one normalchild?
- If I got an A from my father and a O from my mother for my genotype. How would my phenotype be expressed? What is my blood type? Explain your reasoning for both answers.SEATWORK Symbols (for pea plant traits): • T: Tall t: short Analyze the following problems. Determine the possible genotypes, genotypic ratio, phenotypes, and phenotypic ratio from the genetic cross. Show your solution through a Punnett square. Use the symbols provided. • R: Round seeds r: wrinkled seeds • Y: Yellow seeds y: green seeds • P: Purple flower p: white flower 1) Cross a homozygous dominant tall and homozygous round seed pea plant with a heterozygous tall and heterozygous round seed pea plant. 2) Cross a pea plant that is heterozygous for purple flowers and homozygous dominant for yellow seeds with a pea plant that is heterozygous for purple flowers and homozygous recessive for green seeds. 3) Cross a pea plant that is short and has green seeds with a pea plant that is heterozygous tall and has heterozygous yellow seeds.Part of the difficulty of the genetics unit is knowing what type of problem you are being asked to solve and then solving it correctly. The following problems are a mix of normal Mendelian inheritance, incomplete dominance, co-dominance, sex-linked, and dihybrid crosses. Complete each of the problems below. Show your work! It’s difficult for me to know where you are making your mistakes (and help you to correct them) if I cannot see how you completed the problem. in certain fish, the mating of a black (B) fish with a white (W) fish will create offspring with a patchwork of black and white scales. What type of inheritance pattern is this?_____________________________________________ If a black and white fish is crossed with a black fish, what percentage of the fish will be: Black? ___________% White? ____________% Black and white? ___________%
- Part of the difficulty of the genetics unit is knowing what type of problem you are being asked to solve and then solving it correctly. The following problems are a mix of normal Mendelian inheritance, incomplete dominance, co-dominance, sex-linked, and dihybrid crosses. Complete each of the problems below. Show your work! It’s difficult for me to know where you are making your mistakes (and help you to correct them) if I cannot see how you completed the problem. Grasshoppers are black with red stripes (R), yellow stripes (Y), or both red & yellow stripes (RY). A red-striped grasshopper is crossed with red & yellow-striped grasshopper. What type of inheritance pattern is this?__________________________________________ Genotypic ratio: _____________________________ Phenotypic ratio: ____________________________Part of the difficulty of the genetics unit is knowing what type of problem you are being asked to solve and then solving it correctly. The following problems are a mix of normal Mendelian inheritance, incomplete dominance, co-dominance, sex-linked, and dihybrid crosses. Complete each of the problems below. Show your work! It’s difficult for me to know where you are making your mistakes (and help you to correct them) if I cannot see how you completed the problem. In seals, long whiskers (W) are dominant over short whiskers (w). What are the genotypic and phenotypic ratios for the offspring produced by mating a seal that is homozygous recessive with one that is heterozygous? Genotypic Ratio:_______________________________ Phenotypic Ratio:_______________________________Part of the difficulty of the genetics unit is knowing what type of problem you are being asked to solve and then solving it correctly. The following problems are a mix of normal Mendelian inheritance, incomplete dominance, co-dominance, sex-linked, and dihybrid crosses. Complete each of the problems below. Show your work! It’s difficult for me to know where you are making your mistakes (and help you to correct them) if I cannot see how you completed the problem. When a skunk with wide (W) stripes reproduces with a skunk with narrow (w) stripes, their offspring all have medium stripes. A medium-striped skunk mates with another skunk with medium stripes. Determine the frequency of the phenotypes. Wide Stripes: _______________ / 4 Medium Stripes: ____________ / 4 Narrow Stripes: _____________ / 4