1. Questions

Mendelian Genetics

Assume you are performing a cross between a plant that is heterozygous for the dominant traits red flowers and wrinkled seeds, with a plant that is homozygous for the recessive traits white flowers and smooth seeds. Assume the alleles are R for red flowers, r for white flowers, W for wrinkled seeds, and w for smooth seeds. The offspring of this cross show the following phenotypes:

43 red flowers and wrinkled seeds

7 red flowers and smooth seeds

9 white flowers and wrinkled seeds

41 white flowers and smooth seeds

What are the traits of the recombinant offspring in terms of flower color and seed shape? Explain how you know that these offspring are recombinant. What alleles would you expect to see in the individual chromosomes of each parent before and after crossing-over takes place? What is the recombination frequency? What is the distance between the genes in map units?

  1. 👍
  2. 👎
  3. 👁
Sara

  1. The traits of the recombinant offspring in terms of flower color and seed shape:

    Red, smooth
    White, wrinckled
    These are recombinants because they are different with their parents. The genes are the same but they don't share the same alleles as parents.
    The number of recombinants is always less than the number of parental types.

    Genotype of parents: RrWw (red , wrinckled)
    rrww (white , smooth)
    after crossing over : Rrww
    rrWw
    (these two are the genotypes of recombinants)

    recombination frequency = # recombinants / # total progeny
    = 7+9 / 43+41+7+9 = 0.16
    the genes are 16 m.u apart

    1. 👍
    2. 👎
    Me

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    1. Which of the following traits is acquired A. the number of petals that grow in a plant's flowers B. the wing shape of a wild bird C. the ability of some gorillas to use sign language D. a cheetah's ability to run faster than

  2. Science

    What does the notation TT mean to geneticists? A. Two dominant alleles B. Heterozygous C. At least one dominant allele D. One dominant and one recessive allele Is the answer A?

  3. biology

    a heterozygous tall pea plant is crossed with a short plant the probability that an F1 plant will be tall is?

  4. Science

    In pea plants, purple flowers are dominant over white flowers. Which Punnet square correctly shows the cross of a plant with white flowers and a plant that is heterozygous for purple flowers? A. Aa,Aa, aa, aa B. Aa,Aa, Aa,Aa C.

  1. Science

    In pea plants, the allele for purple flowers, P, is dominant over the allele for white flowers, p. Which conclusion about phenotype and genotype is possible?(1 point) If a plant has white flowers, then its genotype must be pp. If

  2. science help asap!!!

    Hi, can someone check my answers asap!!? i am on a deadline!! 1. What doe the notation TT mean to geneticists? (1 point) two dominant alleles heterozygous alleles at least one dominant allele one dominant and one recessive allele

  3. biology

    The American curl is a breed of cat that has curly ears. The allele for curly ears is dominant. Suppose a male cat with the heterozygous genotype is bred to a female cat with the homozygous recessive genotype. Predict the number

  4. SCIENCE HELP

    A plant with dark-purple flowers and a plant with white flowers are crossed. All of the offspring have lavender flowers. The alleles for flower color in this plant are A. Both dominant B. Both recessive C. Codominant D.

  1. Biology Answer Check !!!!

    In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for

  2. bio

    a heterozygous tall pea plant is crossed with a short pea plant.what are the expected genotypic and phenotypic ratio for this cross

  3. Science

    In a certain plant, red flower color(R) is dominant over white(R). if a plant heterozygous for red flower color and one with white flower are crossed, which of the following would be the expected proportion of individual in the

  4. Science

    I need help with a quiz. I just want to clarify these are correct. 1. Which of the following traits is acquired A. The number of petals that grow in a plant's flower B. The wing shape of a wild bird C. The ability of some gorillas

You can view more similar questions or ask a new question.