Problem 2: In summer squash, white fruit is dominant to yellow, and flat fruit is dominant to round. The selected parents are a plant with white-flat fruit (homozygous) and a plant with yellow-round fruit. Carry this cross through the F₂ generation. List phenotypic ratio for the F, generation.
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- 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.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.0 8 Genetics practice problem 2: Cross the F1 individuals • In pea plants purple flowers are dominant to white flowers. If two heterozygous plants are crossed, what are the expected genotype and phenotype ratios of the offspring (the F2 generation)? Genetic practice problem 4: Apply • Albinism (white fur) in guinea pigs in a recessive trait (d). Normal guinea pigs are dark-colored (D). If a two heterozygote guinea pigs have offspring, what are the expected genotype ratios and phenotype ratios of the offspring? 9 Genetics Practice problem 3: The test cross • The 75% of the F2 individuals have a purple phenotype. How did Mendel determine which ones were heterozygous and homozygous? Genetic practice problem 4: Apply • Sickle cell anemia is a recessive trait (a). Typical red blood cells are round, not sickled (A). If a two heterozygote individuals have a child, what is the chance that the child will have sickle cell anemia? Show the Punnett square, write the genotype ratio and phenotype…
- punnett square practice 1. Let's say that in seals, the gene for the length of the whiskers has two alleles. The dominant allele (W) codes long whiskers and the recessive allele (w) codes for short whiskers. a. What is the probability of producing offspring that have short whiskers from a cross of two long-whiskered seals, one that is homozygous dominant and one that is heterozygous? Show your work on the punnett square. % long whiskers % short whiskersDihybrid 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 albinodd-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)? !!!
- Name Legrning Target: I will incorporate ratios Period into the genetics problem. Genetics Worksheet # 2 1. In pea plants, smooth peas (S) are dominant to wrinkled peas (s). Work the following crosses. a. homozygous dominant x recessive Genotypes: Phenotypes: Genotypic ratio: Phenotypic ratio: b. heterozygous x heterozygous Genotypes: Phenotypes: Genotypic ratio: Phenotypic ratio: 2, A man and his wife are both heterozygous for brown eyes (B). They have six children all of whom have blue eyes> How can this happen? List the genotypes of the parents and the children, Show the Punnett square, Parents: Kids: What is the chance that the next child will have blue eyes?Name Period into the genetics problem. Genetics Worksheet # 2 1. In pea plants, smooth peas (S) are dominant to wrinkled peas (s). Work the following crosses. a. homozygous dominant x recessive Genotypes: Phenotypes: Genotypic ratio: Phenotypic ratio: b. heterozygous x heterozygous Genotypes: Phenotypes: Genotypic ratio: Phenotypic ratio: 2, A man and his wife are both heterozygous for brown eyes (B). They have six children all of whom have blue eyes> How can this happen? List the genotypes of the parents and the children. Show the Punnett square. Parents: Kids: What is the chance that the next child will have blue eyes?Background 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.
- 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 SQUAREDirection: 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:Notes Bell Work Assignments Pedigree Chart Key How many females are carriers? |JO - Unaffected How many affected males are there? TO Carrier Complete a Punnett Square for the cross in the F4 generation. 10 Affected The affectedallele is recessive I Could the male in the F5 generation be affected? Could he be a carrier? If 'yes', what chance does he have of being affected? Of being a carrier? (answer is a fraction out of 4) Type here to search W Br