Given three possible phenotypes for parents showing dominance (aa, aa, aa), which combination would produce a 1: 2: 1 ratio of genotypes and a 3: 1 ratio of phenotypes? i. aa x aa ii. aa x aa iii. heterozygous x heterozygous iv. aa x aa v. homozygous dominant x heterozygous a) i, ii, iii, iv, and v only b) iii and iv only c) i and v only d) ii only

B) III and IV only

Explanation:

For IV

The genotype of crossing Aa x Aa gives you

AA, Aa, Aa, aa.

The genotype has:

1 homozygous dominant (AA)

2 heterozygous (Aa)

1 Homozygous recessive (aa)

leaving a genotype ratio of 1:2:1

The phenotype will have A for three of the children, since we have AA, Aa and Aa.

Since A is dominant the phenotype of the above mentioned will show 3 A and wil show 1 a since the is one child with aa and we know that a recessive gen only shows itself when it is on it's own.

Therefore the phenotype ratio is 3:1

For III

The same thing will happen the the way it is for IV.

This is because we are give Two heterozygous which I have already mentioned it means Aa.

So in simple form in II we are given:

Aa x Aa.

Which is the same as IV.

Thus our answer B

well

explanation:

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.