7. In a monohybrid test-cross with simple dominance, the F2 generation is expected to: a. express only the dominant trait b. express both dominant and recessive traits in a 3:1 ratio c. express both dominant and recessive traits in a 9:3:3:1 ratio d. express both dominant and recessive traits in a 1:1 ratio 8. Features that exhibit continuous quantitative variation are often the result of: a. polygenic inheritance b. co-dominance c. epistasis d. pleiotropy 9. In a dihybrid test-cross with complete dominance, the F2 generation is expected to: a. express both dominant and recessive traits in a 1:2:1 ratio b. express both dominant and recessive traits in a 3:1 ratio c. express both dominant and recessive traits in a 9:3:3:1 ratio d. express both dominant and recessive traits in a 1:1 ratio

7. In a monohybrid test-cross with simple dominance, the F2 generation is expected to: a. express only the dominant trait b. express both dominant and recessive traits in a 3:1 ratio c. express both dominant and recessive traits in a 9:3:3:1 ratio d. express both dominant and recessive traits in a 1:1 ratio 8. Features that exhibit continuous quantitative variation are often the result of: a. polygenic inheritance b. co-dominance c. epistasis d. pleiotropy 9. In a dihybrid test-cross with complete dominance, the F2 generation is expected to: a. express both dominant and recessive traits in a 1:2:1 ratio b. express both dominant and recessive traits in a 3:1 ratio c. express both dominant and recessive traits in a 9:3:3:1 ratio d. express both dominant and recessive traits in a 1:1 ratio

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter11: The Basic Principles Of Heredity

Section: Chapter Questions

Problem 10TYU: A walnut comb rooster is mated to three hens. Hen A, which has a walnut comb, has offspring in the...

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7) Skin color is a complex trait and while just a few genes account for the major difference between light and dark skin color, dozens of other genes participate. Assume in this hypothetical scenario there are only two genes for skin color, A and B. Each gene exhibits incomplete dominance. AABB (homozygous dominant for both genes) results in the darkest skin color and aabb (homozygous recessive for both genes) results in the lightest skin color. Tomas is heterozygous for both genes; his partner, Helga, is heterozygous for the A gene and homozygous recessive for the B gene. Construct a Punnett Square showing the cross of this couple. What are the expected genotypes and phenotypes of the children this couple could have?
3. Set up a Punnett square using the following information: Dominate allele for purple corn kernels = R Recessive allele for yellow corn kernels =r Dominate allele for starchy kernels = T Recessive allele for sweet kernals =t Cross a homozygous dominant parent with a heterozygous parent. Using the Punnett square above: a. What is the probability of producing purple, starchy corn kernels? Possible genotype(s)? b. What is the probability of producing yellow, starchy corn kernels? Possible genotype(s)? c.What is the probability of producing purple, sweet corn kernels? Possible genotype(s)? d. What is the probability of producing yellow, sweet corn kernels? Possible genotype(s)?
1. Suppose that black hair is dominant over blonde hair and brown eyes are dominant over blue eyes. The father has black hair (heterozygous) and brown eyes (heterozygous) and the mother have blonde and blue eyes. A. Punnett Square B. Genotype of father C. Genotype of Mother D. What percent of the offspring will be totally heterozygous? E. What is the phenotypic ratio? F. What percent of the offspring will have blonde hair and blue eyes?
4. Attached earlobes are dominant over free hanging earlobes. Complete the Punnett Square for the following individuals: Mom-Bb and Dad=bb Provide the genotype and phenotype ratios using the Punnett square given below. Genotypes 5. When two alleles are observed independently in a phenotype is called multiple alleles. Human blood group ABO is a good example of multiple alleles. The three alleles are: IA, IB, i. Mother's blood type is AB (IAI³) and father's blood type is B (I³i). Provide the genotype and phenotype ratios using the Punnett square given below. Genotypes Phenotypes Genotypes Phenotypes 6. When the allele of a trait is found on X or Y chromosome, it becomes sex-linked. The results differ from males to females. One such example is of red green colorblindness. The mother is a carrier (X© Xº ), and the father is colorblind (X© Y). Provide the genotype and phenotype ratios using the Punnett square given below. Phenotypes
Explain briefly following: 1. Alleles 2. Sex links 3.lethal genes 4. Sex limited and sex influence traits.
1. If one parent is homozygous dominant for a trait, that parent's genotype might be GG. If the other parent is homozygous recessive for the same trait, that parent's genotype would be gg. What are the possible genotypes of their offspring? b. How many different phenotypes might we possibly see in their offspring? 2. If a male is homozygous dominant for a trait, that parent's genotype might be DD. If the female is heterozygous for the same trait, her genotype would be Dd. a. How many genetically different sperm can the male produce? b. Using a Punnett square, determine the expected genotypic ratios of their offspring. What are the expected phenotypic ratios? 3. In garden peas, the gene for red flowers (R) is dominant over the gene for white flowers (r). If pollen (cells containing sperm nuclei) from the anther (male reproductive organ) of a homozygous red-flowered plant is added to the pistil (female reproductive organ containing the egg) of a white- flowered plant: a. c. What would be…
3. Black coat (B) color in Cocker Spaniels is dominant, while red coat (b) color is recessive; solid pattern (S) is dominant, while spotted (s) pattern is recessive. Create a Punnett square that shows all of the possible offspring of a solid black male (BBSs) mated to a solid red female (bbSs). Include the percentage/ratio of occurrence for each phenotype. Include the percentage/ratio of occurrence for each phenotype.
Match the type of genetic dominance with the appropriate term: More than two type of alleles for a given trait Both alleles are expressed equally 1. Complete dominance 2. Incomplete dominance Phenotype of dominant homozygote and heterozygote are same 3. Codominance 4. Multiple Alleles Heterozygotes have intermediate (hybrid) between the two homozygotes
Punnett Square Worksheet Black is the dominant fur color for rabbits and white is the recessive. B stands for the black allele and b represents the white allele. A white rabbit would have a genotype of bb and a black rabbit could have a genotype of BB or Bb. 1. Fill in the missing information for each Punnette square below: Cross 1 Cross 2 Cross 3 в B b B B Cross 4 Cross 5 Cross 6 B b b b B b B Cross 7 Cross 8 Cross 9 b Bb Bb BB Bb b Bb Bb BB Bb 2. List the probability of having black fur for each cross Cross 1: Cross 2: Cross 3: Cross 4: Cross 5: Cross 6: Cross 7: Cross 8: Cross 9: B.
2. Show the cross and provide full justification in each case: a) An F1 x F1 self-fertilization gives a 9:7 phenotypic ratio in the F2. What phenotypic ratio would you expect if you test-crossed the F1? b) An F1 x F1 self-fertilization gives a 9:3:4 phenotypic ratio in the F2. What phenotypic ratio would you expect if you test-crossed the F1? c) An F1 x F1 self-fertilization gives a 15:1 phenotypic ratio in the F2. What phenotypic ratio would you expect if you test-crossed the F1?
1. If the allelic composition of a gene is Aa, the genotype is said to be (homozygous, heterozygous). What is the probability of having "a" allele in gametes? 2. For a genotype of AaBb, what are the possible allele compositions in gametes? 3. What are the possible genotypes and phenotypes ("A" phenotype or "a" phenotype) in the offspring of a monohybrid cross Aa x Aa? 4. If the organism display a dominant phenotype for a trait ("A" phenotype), how does one determine if the genotype is homozygous or heterozygous? Please use the Punnett square to explain. 5. How many possible genotypes are there in the offspring of a dihybrid cross AaBb x AaBb? What are the possible phenotypes for such a cross? What is the phenotypic ratio for AB : Ab : aB : ab? D Focus 72°F DEA F4 PrtScr Insert Hor F5 F6 F7 F8 F9 F10 F11 F12 24 & 3. 8 E R T Y U
2.) (6) Assume that brown eyes are dominant = B, blue eyes are recessive = b. My first wife has blues eyes. I know I am homozygous dominant a. What is her genotype? b. What are her possible gamete genotypes? c. What is my genotype? d. What are my possible gamete genotypes? What genotype(s) do you expect of our offspring? Show your work (Punnett square is a good idea). e.