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.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )