In some cats, the length of the tail shows incomplete dominance. The tail can be long (L), short (S), or intermediate in length (LS). Identify the genotype and phenotype ratios of a cross between a cat with a short tail and one with a medium tail. P Genotypic Ratio: I | | Phenotypic Ratio: |
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- PROBLEM 3: Using the Punnett square, determine the different combination of gametes with the genotypes G9MM (paternal) and ggmm (maternal). G is dominant for having a widows peak and g is recessive for not having a widow's peak. M is dominant for having the ability to roll the tongque and m is recessive for not having the ability to roll the tongue. Determine the following: a. What are the offsprings phenotype: b. What are the offsprings genotype: c. Probability of widow's peak and can tongue roll d. Probability of offspring with no widow's peak but can roll its tonque e. PUNNETT SQUAREBackground Problem N° 6 Objective: To illustrate the differences between the dominant/recessive model vs. partial (or incomplete) dominance model. In incomplete dominance, the phenotype is neither dominant nor recessive, but intermediate instead. a. Explain why a monohybrid cross of snapdragon plants carrying white flowers with red-flowered plants produces all pink flowers in the F1 generation. [Hint: What makes flowers red, purple, yellow, etc.?] b. What are the genotypic and phenotypic ratios of snapdragon flowers in the F2 generation? True breeding individual = Homozygous for either trait.dd-ons Help в I U A Calibri 12 三 三1 |:三 6. Consider a guinea pig with a homozygous genotype and a white fur color phenotype. a. What is the probability this parent will produce a gamete with the dominant allele? b. What is the probability this parent will produce a gamete with the recessive allele? C. If 31 sperm cells are collected from this guinea pig, how many would you expect to have the recessive allele (as determined by sequencing the gene)? !!!
- Problem 3: In snapdragons, the inheritance of flower color and size of leaves are examples of Incomplete Dominance. When red flowered plants are crossed with white, the offspring have pink flowers. Similarly, when a plant with broad leaves is crossed with plants having narrow leaves, the offspring have intermediate leaves. Regarding a cross between a homozygous red-flowered, broad- leaved plant with a homozygous white-flowered, narrow-leaved plant. What are the phenotypes and their ratio in the F1 generation? Construct a Punnett square. What are the phenotypes and their ratio in the F2 generation? Construct a Punnett square.Genetic Problems Read the following genetic problems, and then complete the activities and questions for each problem 1. In the pea plant, the green pod color allele is dominant to the yellow pod color allele. o Set-up a monohybrid cross between a pea plant that is heterozygous and a true-breeding yellow pod pea plant. o What percentage of the offspring produced from this cross would you expect to have yellow pods? 2. Within a mouse population, the black fur allele (B) is dominant to the white fur allele (b) and the short whisker allele (S) is dominant to the ngs long-whisker allele (s). o A heterozygous black-furred short-whiskered mouse is crossed with a homozygous white-furred long-whiskered mouse. o What percentage of the offspring will be black-furred with long whiskers? 3. A physician is examining the blood types of children from a family. o Child 1 has blood type AB, Child 2 has blood type B, Child 3 has blood type B, and Child 4 has blood type A. o Based on the phenotypes of…In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant: heterozygous:homozygous recessive) would you expect to observe in the offspring? a. 1:2:1 b. 3:1:1 c. 1:2:0 d. 0:2:1
- Background and/or Instructions Problem N° 9 Objective: To apply the concept of codominance in the prediction of horse coat color. In codominance, both alleles are expressed; both gene products are measurable or visible as an additional phenotype that is neither dominant nor recessive nor intermediate. In incomplete (partial) dominance an intermediate trait is produced. Cremello: Palomino: Chestnut: almost white golden with lighter mane and tail reddish brown Coat color of horses is a very complex trait. The colors cremello, chestnut and palomino can be explained using a codominant model The following table gives ratios obtained in matings of the above horse (Equus caballus) varieties: Cross Parents Offspring of inheritance and are known to be cremello x cremello all cremello determined by alleles at a single locus in horses. chestnut x chestnut all chestnut For this problem, use the genotypes: II cremello x chestnut all palomino C'C' = cremello C'C? = chestnut IV palomino x palomino %…Direction: Answer the following problems: 1. Predict the phenotypic ratios of offspring when a homozygous white cow is crossed with a roan bull. Illustrate using a Punnett square. 2. Complete the Punnett square for a cross between a black chicken (BB) and a white chicken (WW). Give the phenotype of the offspring in the F1 generation. Кey BB – black ww- white F1 BW – checkered Phenotype:2. Cows have codominance inheritance rules for their coat color. Cows with the genotype BB are completely black, those with the genotype WW are completely white, and with genotype BW have black and white spots across their body. Draw a Punnett Square that shows the genotypes and phenotypes of the offspring from a heterozygous coated cow and a homozygous white coated cow? Indicate also the genotypic and phenotypic % below:
- Dihybrid Cross Problem 1: Predicting combinations of alleles in gametes of plants heterozygous for two traits. A pea plant is heterozygous for both seed shape and seed color. S is the allele for the dominant, spherical shape characteristic; s is the allele for the recessive, dented shape characteristic. Y is the allele for the dominant, yellow color characteristic; y is the allele for the recessive, green color characteristic. What will be the distribution of these two alleles in this plant's gametes? A. 50% of gametes are Sy: 50% of gametes are sY B. 25% of gametes are SY; 25% of gametes are Sy: 25% of gametes are sY; 25% of gametes are sy. C. 50% of gametes are sy: 50% of gametes are SY D. 100% of the gametes are SsYy E. 50% of gametes are SsYy: 50% of gametes are SSYY.Dihybrid Cross Problem Set Problem 13: AaBb dihybrid cross involving epistasis. Two unlinked loci effect mouse hair color. AA or Aa mice are agouti. Mice with genotype aa are albino because all pigment production is blocked. regardless of the phenotype at the second locus. At the second locus, the B allele (agouti coat) is dominant to the b allele (black coat). What would be the result of a cross between two agouti mice of genotype AaBb? A. 4 agouti: 4 black: 8 albino B. 9 agouti: 3 black: 3 albino: 1 grey C. 9 agouti: 3 black: 4 albino D. 8 agouti: 4 black: 4 albinoProblem #3 In some plants, green pod color (G) is dominant to yellow pod color (g). If an individual that was heterozygous for green pods were crossed with one that was homozygous for green pods, identify the genotype and phenotype ratios of the offspring. P Genotypic Ratio: Phenotypic Ratio: