EOC: Genetics

In a population of caterpillars, lime-green color with black spots is dominant (L) over lime-green color with no black spots (l). Which of the following results below would be expected from a cross of two heterozygous parents for this trait? Plug into a punnett square on scratch paper.

• 100% Ll

• 50% Ll, 25% LL, 25% ll

• 50% Ll, 50% ll

• 75% LL, 25% Ll

Tags

NGSS.HS-LS3-3

What process do gametes use to divide?

During meiosis, genetic recombination results because–

• chromosomes assort independently, and crossing-over occurs.

• genes from different species can freely mix together.

• gene mutations occur more frequently than at other times.

• cells divide only once, resulting in genetically identical cells.

Tags

NGSS.HS-LS3-2

If a corn plant has a genotype of Ttyy, what are the possible genetic combinations that could result in a single grain of pollen from this plant? Use the FOIL (first, outer, inner, last) method.

• Ty, ty

• TT, ty

• TY, Ty, ty

• Tt, ty, tY, TY

The gene for tallness (T) in a pea plant is dominant over the gene for shortness (t). In a cross between two heterozygous parent pea plants, we can predict that what percentage of the offspring will be tall? Plug into a punnet square and type the percentage

Tags

NGSS.HS-LS3-3

The incomplete Punnett square here shows only one portion of the predicted outcomes for a cross between two mice for the trait of fur color. Agouti (A) is dominant over black (a) coloration. One parent is heterozygous, and the other is homozygous recessive.

• Zero

• One

• Two

• Three

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In a particular species, red hair (H) is a dominant trait for hair color over white hair (h). What will be the expected result of the offspring produced from a cross of two parents, HH x Hh?

• 100% white hair

• 50% red hair, 50% white hair

• 75% red hair, 25% white hair

• 100% red hair

Tags

NGSS.HS-LS3-1

The gene for tallness (T) in a pea plant is dominant over the gene for shortness (t). The Punnett square below shows the cross between two tall pea plants (Tt). What is the phenotypic ratio of the offspring produced as a result of the cross?

• 1:2:1

• 9:3:3:1

• 3:1

• 2:1

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Select all the examples of a Gentotype.

• Tt

• genetic material

• Physical apperance

• Rr or rr

• Eye color

Select all examples of a phenotype.

• Brown eyes

• How a person looks

• Bb of bb

• DNA

• Hair color