Concept explainers
a.
To determine: The differences between gene, allele, and locus.
Introduction: The genotype is the genetic constitution of the organism while the
b.
To determine: The differences between the genotype and phenotype.
Introduction: When the alleles inherited by the zygote are same then the genotype of the individual is called homozygous whereas, when the zygote inherits two different alleles it is called heterozygote.
c.
To determine: The differences between dominant and recessive.
Introduction: The alleles are the two contrasting variants of characters controlled by a specific gene. These alleles are distributed into the gametes during meiosis and then combined in a zygote during fertilization.
d.
To determine: The differences between complete dominance, incomplete dominance, and codominance.
Introduction: Gregor Mendel was an Austrian monk, who worked on a pea plant to observe the pattern of inheritance of certain characters from the parent plant to the offsprings. He termed genes as factors that were passed from one generation to another. He proposed three laws which came are known as Mendel’s law of genetics.
Want to see the full answer?
Check out a sample textbook solutionChapter 3 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
- Crossing Pea Plants: Mendels Study of Single Traits Stem length in pea plants is controlled by a single gene. Consider the cross of a true-breeding long-stemmed variety to a true-breeding short-stemmed variety in which long stems are completely dominant. a. If 120 F1 plants are examined, how many plants are expected to be long stemmed? Short stemmed? b. Assign genotypes to both P1 varieties and to all phenotypes listed in (a). c. A long-stemmed F1 plant is self-crossed. Of 300 F2 plants, how many should be long stemmed? Short stemmed? d. For the F2 plants mentioned in (c), what is the expected genotypic ratio?arrow_forwardMendel performs a cross using a true-breeding pea plant with round, yellow seeds and a true- breeding pea plant with green, wrinkled seeds. What is the probability that offspring will have green, round seeds? Calculate the probability for the F1 and F2 generations.arrow_forwardThe petal color of a species of flowers is inherited along Mendelian ratios. A cross of two plants with red flowers produces 1,068 plants with red flowers and 390 plants with yellow flowers. Propose a model to explain the inheritance of red and yellow flowers. Determine the probability of producing a plant with yellow flowers when a heterozygous plant with red flowers is crossed with a homozygous plant with yellow flowers.arrow_forward
- SELECT ALL THAT APPLIES. Which of the following statements are true regarding Mendel's observations of two factor crosses?arrow_forwardThe continuity of life is based on heritable information in the form of DNA. Use the law of segregation and the law of independent assortment to explain how the passage of genes from parents to offspring (as alleles) ensures the perpetuation of parental traits in offspring and genetic variation among offspring. Describe briefly how Mendel demonstrated each of these laws.arrow_forwardPlease EXPLAIN the key difference(s) between Segregation (as described by Mendel) and Independent Assortment.arrow_forward
- INTRODUCTION: Pedigrees are symbolic representations of family relationships and the transmission of inherited traits. For researchers, families are tools; the bigger the family, the easier it is to discern modes of inheritance. Pedigrees apply Mendel’s laws to predict the recurrence risks of inherited conditions. INSTRUCTION: Discuss the pedigree using appropriate terms.arrow_forwardNeep help ASAP. A red flowered plant was crossed with a blue flowered plant and produced all purple flowered plants. When the purple flowered plants were crossed with each other they produced 5 red plants, 5 blue plants, 20 deep purple plants, 20 light lilac plants, and 30 purple plants How many genes are involved in the color production? Assume that red color is caused by an A allele and blue color by a B allele and determine the likely genotype of the plants in the F2 generation.arrow_forwardUsing Mendel’s lines of peas, describe how you would use a test cross experimental design to determine the genotype of a pea plant with purple flowers. Be very specific in describing your experimental design and how you would interpret your results based on the proportion of offspring phenotypes. Make sure to include all possible offspring phenotypes in your answer and what the proportion of phenotypes tells you about the purple plant genotype.arrow_forward
- Mendelian Genetics Consider blue eyes in a man as recessive to brown eyes. Show the expected children of a marriage between a blue-eyed woman and brown-eyed man who had a blue-eyed mother. Determine the genotypic ratio (GR) and phenotypic ratio (PR) of the F1 using Punnett Square Method. Hint: Determine the genotypes of each individual first.arrow_forwardREad and analyzed the following genetic problem. Show complete solution (Genotypes of P, Punnet Square and GR,PR). 1. In the garden peas, green pod color is dominant over yellow pods. Also, round seed shape is dominant over wrinkled seed. Cross fertilization was done between a pea that is homozygous dominant for pod color with heterozygous round shape and another pea that is heterozygous for both pod color and seed shape. Determine the genotypic and phenotypic ratio of teh offspring.arrow_forwardExplain- Mendel’s Fourth Postulate: Independent Assortment ?arrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage LearningBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax