n shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a patches of red and patches of white hairs. The following data are obtained from various crosses: Red x red > all red White x white > all white Red x white > all roan Roan x roan > 25 % red, 50% roan, 25% white From these results, determine the appropriate allele symbols and indicate which genotypes lead to which phenotypes. What are the genotypes of the parents and offspring in each cross above? Predict the results of a red x roan cross.

n shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a patches of red and patches of white hairs. The following data are obtained from various crosses: Red x red > all red White x white > all white Red x white > all roan Roan x roan > 25 % red, 50% roan, 25% white From these results, determine the appropriate allele symbols and indicate which genotypes lead to which phenotypes. What are the genotypes of the parents and offspring in each cross above? Predict the results of a red x roan cross.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter5: The Inheritance Of Complex Traits

Section: Chapter Questions

Problem 7QP: Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1...

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In shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a mixture of red and white hairs. The following data were obtained from various crosses: red * red ¡ all red white * white ¡ all white red * white ¡ all roan roan * roan ¡ 1/4 red:1/2 roan: 1/4 white How is coat color inherited? What are the genotypes of parents and offspring for each cross?
: In poultry, the genotype-phenotype relationships for comb shape are R/– P/–, walnut; R/–p/p, rose, r/r P/–, pea; and r/r p/p, single. What will be the comb characters of the offspring ofthe following crosses?a) A walnut crossed with a single produces offspring that are walnut, rose, pea, and single.b) A rose crossed with a walnut produces offspring that are walnut, rose, pea, and single.c) A rose crossed with a pea produces five walnut and six rose offspring.d) A walnut crossed with a walnut produces one rose, two walnut, and one singleoffspring
In birds, wingspan is determined by two genes, one with complete dominance of one allele over the other, one with additive effects. Birds with genotype aabb has 16 cm long wingspan, whereas those with AABB has 20 cm long wingspan. A cross between AABB and aabb parents produced F1 with 19cm wingspan. Crossing the F1s produced F2 with the following phenotypes (in cm): NOTE: In a normal distribution of values, 68% of them will fall within the range of the mean less one standard deviation and the mean plus one standard deviation. Compute for: a. compute for number of classes b. compute for the range c. compute for the interval
A snapdragon plant that bred true for white petals was crossed to a plant that bred true for purple petals and all the F1 have white petals. The F1 was selfed. Among the F2 three phenotypes were observed in the following numbers: White--> 240 Solid Purple --> 61 Spotted Purple --> 19 a) Propose the correct genetic explanation for this phenomenon. Define your genetic symbols and show the genotypes of the Parentals, F1, and F2 individuals above. You may use underscores ( _ ) where appropriate. Please clearly label your answer. b) Complete a chi square to defend your answer. Be sure to include chi, Ho and Ha. Do not forget to interpret your test.
From a presumed testcross of 2 plants of genotype Aa x aa (in which A represents red and a represents white petals on a plant) we get 5000 red petal plants, and 5400 white petals plants. Using the Chi-squared test, what chi-squared value do we get for this?
E. W. Lindstrom crossed two corn plants with green seedlings and obtained the following progeny: 3583 green seedlings, 853 virescentwhite seedlings, and 260 yellow seedlings . Q. Is there epistasis among the genes that determine color in the corn seedlings? If so, which gene is epistatic and which is hypostatic?
Two true-breeding pea plants are crossed. One parent is round, terminal, violet, constricted, while the other expresses the con- trasting phenotypes of wrinkled, axial, white, full. The four pairs of contrasting traits are controlled by four genes, each located on a separate chromosome. In the F1 generation, only round, axial, violet, and full are expressed. In the F2 generation, all possible combinations of these traits are expressed in ratios consistent with Mendelian inheritance.(a) What conclusion can you draw about the inheritance of these traits based on the F1 results?(b) Which phenotype appears most frequently in the F2 results? Write a mathematical expression that predicts the frequency of occurrence of this phenotype.(c) Which F2 phenotype is expected to occur least frequently? Write a mathematical expression that predicts this frequency.(d) How often is either P1 phenotype likely to occur in the F2 generation?(e) If the F1 plant is testcrossed, how many different pheno-…
For many students, calculating the chi square value is the most challenging part of conducting a chi square test so it is important to practice. Consider the following information: An F1 tall, round seed pea plant is crossed with a dwarf, wrinkled seed pea plant. The following offspring are observed: Tall, round: 510 Tall, wrinkled: 495 Dwarf, round: 490 Dwarf, wrinkled: 505 a. What is the expected phenotype ratio? #:# or #:#:#:#, depending on what you think the answer is. b. What is the calculated chi-square value? Format your answer with 1 significant digit (i.e. 0.#). c. What is the critical chi-square value from the table provided in the book at the P=0.05 level of significance? Enter the number exactly as shown in this table.
Kernel color in wheat is controlled by 2 pairs of genes (AABB). Determine the color of each offspring with the following genotypes: (Note: 4 alleles – red; 3 – medium red; 2 – intermediate red; 1 – light red; 0 – white). CAPITAL letters only and with spaces when applicable. AABb - AaBb - AABB - aaBb - aabb -
A sex-influenced trait is dominant in males and causes bushy tails.The same trait is recessive in females. Fur color is not sex influenced.Yellow fur is dominant to white fur. A true-breeding femalewith a bushy tail and yellow fur was crossed to a white male withouta bushy tail (i.e., a normal tail). The F1 females were thencrossed to white males without bushy tails. The following resultswere obtained:A. Conduct a chi square analysis to determine if these two genesare linked.B. If the genes are linked, calculate the map distance betweenthem. Explain which data you used in your calculation.
In an intra-species cross performed in mustard plants of two different species (Brassica juncea and Brassica oleracea), a tall plant (TT) was crossed with a dwarf (tt) variety in each of the two species. The members of the F1 generation were crossed to produce the F2 generation. Of the F2 plants, Brassica juncea had 60 tall and 20 dwarf plants, while Brassica oleracea had 100 tall and 20 dwarf plants. Use chi-square analysis to analyze these results.
Kernel color in wheat is controlled by 2 pairs of genes (AABB). Determine the color of the offspring with the following genotypes: (Note: 4 contributing alleles – red; 3 contributing alleles – medium red; 2 contributing alleles – intermediate red; 1 contributing allele – red; and 0 – white (AAbb x AaBb, AABb x Aabb, aaBb x Aabb, AABb x aabb, AABb x AaBb) Refer to the problem above, a wheat plant producing medium red seed is crossed with another plant producing intermediate red seed. How many individuals will be? Red Medium red Intermediate red Light red White