Study

Genetics

  •   0%
  •  0     0     0

  • On a Punnett Square, each box represents what percentage?
    25%
  • Recessive alleles are represented by what type of letter?
    Lowercase or "little"
  • The different forms of a gene are called...
    alleles
  • Long stalks in some plants are dominant to short stalks. Using the letter "L", what are the possible genotypes of a heterozygous mother and a recessive father?
    Ll and ll
  • If an organism is heterozygous, does it show the dominant or recessive trait?
    Dominant
  • 13) A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. a. What are the genotypes of the parents?
    RR and rr
  • The study of genetics is called...
    heredity
  • If the parent is heterozygous, is their phenotype dominant or recessive?
    Dominant
  • Give an example of homozygous dominant genotype using the letter "D"
    DD
  • Give an example of the three (3) options of the genotypes using the letter "T"
    TT, Tt, tt
  • In leprechauns, orange hair is dominant to green hair. If you use the letter "H", what genotypes would result in orange hair?
    HH. Hh
  • A gene is...
    all of the mentioned
    a set of intsructions
    segment of DNA
    determines the phenotype
  • Alleles are represented by....
    letters
  • Dominant alleles are represented by what type of letter?
    Capital or "big" letter
  • 11) A Tt plant is crossed with a Tt plant. What percentage of the offspring will be short
    1/4, 25%
  • An organism with 2 identical alleles for a trait is considered
    homozygous (purebred)
  • 10) A TT (tall) plant is crossed with a tt (short plant). What percentage of the offspring will be tall?
    4/4 - all - 100%
  • If a plant with purple flowers is crossed with a plant that has white flowers and ALL the offspring have purple flowers, which color is dominant?
    Purple
  • In penguins, redd are dominant to orange feet. What are the possible off spring phenotypes and probabilities of a homozygous dominant mother and a heterozygous father?
    100% red
  • On a Punnett Square, the parents are located on....
    the top and side
  • If an organism shows the recessive trait, is it heterozygous or homozygous?
    Homozygous
  • 13) A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. b. What percentage of the offspring will also be homozygous?
    0%
  • When you need to determine if an organism is homozygous or heterozygous, you need to cross it with a recessive organism and look at the offspring. Why?
    If there are any offspring showing the recessive trait, the dominant individual must be carrying the recessive allele - heterozygous
  • 12) A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous round?
    2/4, 50%