1) Calculate the percent heterosis for a trait where breed A averages 100 lbs, breed B averages 150 lbs, and the F1 averages 140 lbs. Calculate the percent heterosis.
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1) Calculate the percent heterosis for a trait where breed A averages 100 lbs, breed B averages 150 lbs, and the F1 averages 140 lbs. Calculate the percent heterosis.
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- 2) Breed C averages 230 lbs, breed D averages 150 lbs, and the percent heterosis is 8%. Calculate the average phenotype of the F1A dark-red strain and a white strain of wheat are crossed andproduce an intermediate, medium-red F1. When the F1 plants areinterbred, an F2 generation is produced in a ratio of 1 dark-red:4 medium-dark-red: 6 medium-red: 4 light-red: 1 white. Furthercrosses reveal that the dark-red and white F2 plants are truebreeding. How many additive alleles are needed to produce each possiblephenotype?Seed weight in a particular plant species is determined by pairs of alleles attwo loci (a+ a− and b+ b−) that are additive and equal in their effects. Plantswith genotype a− a− b− b− have seeds that average 1 g in weight, whereasplants with genotype a+ a+ b+ b+ have seeds that average 3.4 g in weight. Aplant with genotype a− a− b− b− is crossed with a plant of genotype a+ a+ b+b+.a. What is the predicted weight of seeds from the F1 progeny of this cross?b. If the F1 plants are intercrossed, what are the expected seed weights andproportions of the F2 plants?
- In a herd of dairy cattle, milk yield and the percentage of butterfat exhibit a geneticcorrelation of −0.38. If greater milk yield is selected in this herd, what will be the effecton the percentage of butterfat?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 a. AAbb x AaBbb. AABb x Aabbc. aaBb x Aabbd. AABb x aabbe. AABb x AaBbIn domestic chicken, feather colour and shape are two traits which are controlled by autosomal alleles that are co-dominant. Table 2 shows the alleles and phenotype of both traits. The heterozygous state for feather colour is grey while the heterozygous state for feather shape is mildly frizzled. TABLE 2 Trait Allele Effect Feather colour CB Produces black feathers in homozygotes CW Produces white feathers in homozygotes Feather shape SS Produces straight feathers in homozygotes SF Produces frizzled feathers in homozygotes (a)A farmer bred a black frizzled rooster with a grey mildly frizzled hen. Draw a genetic diagram to show the expected results of this cross. Include in your answer the phenotypic ratios. (b)Is it necessary to do a test cross to determine the genotypes of the offspring? Explain your answer. (c)The farmer would like all his chickens grey and mildly…
- The pedigree shown below depicts crosses performed as part of an antelope captive-breeding program. Use the pedigree information to calculate the coefficient of inbreeding (F) for the mating of IV-12 and III-9 that produces the animal identified as V-13.If there is a maximum Lod score of 4.2 at θ = 0.31, what can you say about the linkage and the distance between two genes?In a certain species of plant loci A, B and C have an additive effect on the colour of the flower. Alleles A, B, and C are dominant and alleles a, b and c are recessive. Knowing that a plant with genotype AAbbCc has a pink flower, which genotype, among the ones listed below, will produce the same phenotype? a. AABBCc b. AaBbCc c. Aabbcc d. aabbcc
- If RR stands for red, RR' stands for roan and R'R' stands for white; as well as B stands for bucking, which is dominant over b which is easy riding, what will be the chance of getting a roan, easy riding horse from a cross between 2 roan, heterozygous bucking horses? 9/16 1/8 1/4 3/16In tomatoes, tall plant (D) is dominant over dwarf plant (d) and smooth fruit (H) is dominant over hairy fruit (h). A farmer crosses tall plant that produces smooth tomatoes (plant A) with a dwarf and hairy fruit plant (plant B) and obtains the following results: Phenotype Offspring Tall & smooth fruit 3 Tall and hairy fruit 84 Dwarf and smooth fruit 88 Dwarf & hairy fruit 4 What is the map distance between the D and H alleles? 13.7 mu 14 mu 3.9 mu 17.2 mu 24.6 muTwo pairs of genes (TTLL) are postulated to influence the size of corn in certain varieties with equal and additive effects. A tall corn variety averaging 6 feet was crossed with a dwarf corn variety averaging 2 feet. (a) If the size of the dwarf is attributed to the genotype (ttll), what is the effect of each gene that increases the size above 2 feet? (b) Diagram a cross between a large and small variety, and classify the expected F2 phenotypes.