Tongue-curling in humans is a dominant genetic trait.

a) suppose a man who is Tt for tongue-curling marries a woman who is also Tt for this trait. What are the possible genotypes and phenotypes of the offspring? What is percentage chance of each type?

        T               t

T      TT            Tt

t       Tt              tt

Roughly 1/4 of their offspring will not have the tongue-curling gene. The possible genotypes are TT(Has), Tt (Has), tt (Doesn't have)

-Genotypes: 25% TT, 50% Tt, 25% tt.

-Phenotypes: 75% have the trait for tongue curling, the other 25% do not have the trait for tongue curling.

-Percentage change of each type: 25% TT (homozygous dominant), 50% Tt (heterozygous), and 25% tt (homozygous recessive).

Explanation:

So to calculate the probably of off spring, we usually make a Punnett square.

Since a Tt man marries a Tt woman, they produce "offspring" (babies) that look like this in a Punnett square:

TT Tt

Tt tt

Looking from this Punnett square, we have one that is TT, two that are Tt, and one that is tt, a total of four. Your genotypes are the genetical traits, so out of the four, you take a percentage and calculate the genes: 25% TT, 50% Tt, and 25% tt. Your phenotypes are your physical traits, so 75% will have the "tongue-curling" trait as the trait T is dominant in three of them (TT, Tt, and Tt), and the other 25% will NOT have the trait.

answer; ///i believe the correct answer is (

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle