Science - biology

posted by .

If you did not know whether brown or yellow alleles were dominant in corn, how could you tell with reasonable certainty? If you used a punette square to find out which one is dominant, how would you know which letters to use for each parent to figure out the F1 generation?

  • Science - biology -

    If the two genes are in the same allele, both parents are heterozygous, and the genes are either dominant or recessive, then about 25% of F1 generation will show recessive phenotype and 75% will show the dominant phenotype.

    Homozygous = BB or YY

    Heterozygous = BY

    Once you find out which is dominant and which is recessive, use a lower case letter to indicate the recessive gene.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Biology

    Okay, I need help. "If short hair (L) is dominant to long hair (l), then what fraction of the offspring produced by a cross of Llxll will be homozygous dominant?
  2. Statistics

    Suppose that the allele for tallness (T) is dominant over shortness (t); that for Yellow (Y) is dominant over green (y); and that for roundness (W) is dominant over wrinkled (w). Suppose we cross two plants with genotypes TTYyWw and …
  3. biology

    a gene with two dominant alleles that expressed at the same time is- a) codominant b) mutational c) incompletely dominant d) polygenic I know its not c
  4. science

    In this lab, we will be looking at Indian Corn that is the result of two parents. The parents were both Yy Ss. Y is yellow, y stands for white. The Yellow trait is dominant. S is smooth, s is shrunken. Smooth is dominant. Before we …
  5. Biology

    Populations are frequently NOT in equilibrium due to selection or other evolutionary forces. Imagine a population of 100 individuals. Forty-nine of the individuals are homozygous dominant for beady-eye gene, 9 are heterozygous and …
  6. Science

    Human blood type is determined by co-dominant alleles. There are three different alleles, know as I^a and I^b alleles are co-dominant and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, …
  7. science

    A pea plant with yellow seeds is crossed with a pea plant with green. All of the offspring have yellow seeds. The allele for yellow seeds is A. Dominant because all of the offspring have yellow seeds. B. Recessive because all of the …
  8. Science

    What does the notation TT mean to geneticists?
  9. Science

    The letters that represent the different forms of a gene are called...?
  10. Biology HELP

    How do you know whether something is homozygous dominant or heterozygous dominant?

More Similar Questions