Question

Which of the following statements is true?

A person with type O blood has two recessive genes.
Intelligence is controlled by a single gene.
Tt and tt plants have the same phenotype.
In codominance, both genes are recessive.

Answer 1

Answer:

The true statement is the first one, "A person with type O blood has two recessive genes".

Explanation:

Types A and B blood are dominant, while type O is recessive. If someone's genotype for blood is AO or BO, they will have type A or type B blood. It is only if the genotype appears as OO that the person will have type O blood.

For the other answers, intelligence is thought to be controlled by many different genes, Tt and tt plants would both show different traits (one being the dominant trait, and the other being the recessive trait), and in codominance both genes are dominant.

Hope this helps!

Answer 2

Answer:

A person with type blood has two recessive genes.

Intelligence is controlled by a single gene.

Explanation:

hope i helped