Colorblindness is a sex-linked trait. a mother with normal vision and a man who is colorblind have a colorblind daughter. what statement must be true about the parents?

The child must have a father who is colorblind and a mother who is a carrier/ is colorblind.

Explanation:

The genetic code for color blindness is carried upon the x chromosome. This means that a male- who has only one X chromosome- only needs their mother to be a carrier to be colorblind. Women on the other hand, need two to be color blind, as the faulty x chromosome can be weeded out by the other.

Therefore, the father, in order to pass on the colorblindness, must be colorblind himself, whereas the mother only needs to be a carrier (or can be completely color blind herself).

A)The mother is a heterozygous carrier

Explanation:

A)The mother is a heterozygous carrier.   - only one that makes sense

B)The father is a heterozygous carrier.  - he is double recessive

C)The mother cannot have the colorblind gene.- that is possible

D)The mother is homozygous dominant for normal vision. - that would mean the 100% of the offspring would be normal

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.