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- In 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…In a three point cross problem for genes Q, L, and T, you have identified the parentals and double recombinants. Using that data (shown below), what is the order of the genes? Type: Alleles parental q L t parental Q l T double cross over q L T double cross over Q l t Group of answer choices L Q T L T Q T L Q the correct answer is not availableIn cows, there is a "splotchy" phenotype that is splotches of brown and white. A true-breeding white cow (homozygous recessive) is bred to a true-breeding brown cow (homozygous dominant). In the resulting offspring, 75% have spots of brown and white and 25% are brown. The phenotype described displays what kind of relationship(s) between alleles? Incomplete penetrance Incomplete penetrance Variable expressivity Variable expressivity Incomplete dominance Incomplete dominance Codominance
- Repeat this process for the following genotypic frequencies for the presence or absence of mid-digital hair by a typical 1407 class: Frequency of homozygous dominants (HH, mid-digital hair present): 0.21 Frequency of heterozygous individuals (Hh, mid-digital hair present): 0.16 Frequency of homozygous recessives (hh, no mid-digital hair): 0.63 Total No. of alleles present: _____________ Number of dominant alleles possessed by homozygous dominants: _____________ Number of recessive alleles possessed by homozygous recessives: _____________ Number of dominant alleles possessed by heterozygotes: _____________ Number of recessive alleles possessed by heterozygotes: _____________ Total number of dominant alleles in the population: _____________ Frequency of the dominant allele (H) in the population: _____________ Frequency of the recessive allele (h) in the population: _____________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 garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a tall plant with white flowers produces 3/8 tall purple, 1/8 tall white, 3/8 dwarf purple, and 1/8 dwarf white. What is the genotype of the parents? a. Dd Pp x Dd pp b. DD Pp x dd pp c. DD Pp x dd Pp d. Dd Pp x Dd Pp e. Dd pp x dd Pp
- Assume that the count of F2 phenotypes you got is as follows: Phenotype F2 count b P t 90 b P T 5 b p t 23 B P t 267 B p t 7 B p T 73 b p T 254 B P T 18 Which gene is in the middle? Group of answer choices T It could be any of P, B, or T B PA cross was performed using Drosophila melanogaster involving a female known to be heterozygous for both ebony body and sepia eyes and a male known to be homozygous for both of these recessive traits. The following data was produced from the cross. Test these data to determine if they are significantly different from the expected phenotypic ratio. Remember to use the 5% level of significance Wild eye Wild body – 102, Wild eye Ebony body – 94, Sepia eye Wild body – 100, Sepia eye Ebony body – 93. Your answer should include the hypothesized cross in genotypes, the Chi-squared value, the critical value and whether you reject or do not reject.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
- A pea plant is heterozygous for seed shape and homozygous dominant for seed color. It was crossed with a plant with the same traits. R is the allele for round seed; r is the allele for wrinkled seed. y is the allele for green seed color. Solve the following: GR: PR: Probability:In corn plants, a dominant allele (K) allows kernel colour and a recessive allele (k) inhibits kernel colour when homozygous. On a different chromosome, the dominant gene P causes purple kernel colour and the homozygous recessive genotype causes red kernel colour.A true breeding white corn plant was crossed with a purple corn plant, yielding 50% red corn plants and 50% purple corn plants.What are the genotypes of the parental corn plants? Select one: a. KKPp kkpp b. KkPP kkPP c. kkPp KkPp d. KKPP kkPpTwo linked loci have a recombination frequency of 5%. A series of crosses is performed. The P generation includes an individual that is homozygous dominant for trait 1 and homozygous recessive for trait 2. The second individual is homozygous recessive for trait 1 and homozygous dominant for trait 2. The F1 generation is crossed with individuals that are homozygous recessive for both traits. If 400 F2 offspring are produced, how many offspring with each phenotype are expected? Fill in the table below with your answers. Phenotype Number of Offspring Predicted Recessive 1, Recessive 2 Dominant 1, Dominant 2 Recessive 1, Dominant 2 Dominant 1, Recessive 2 Total offspring 400 For the results above, determine which phenotypes are parental and which are recombinant. Phenotype Parental or Recombinant? Dominant 1, Dominant 2 Recessive 1, Dominant 2 Recessive 1, Recessive 2 Dominant 1, Recessive 2