To a curly haired mother and straight haired father 8 children are born. The ratio of curly and straight haired will be

1) 6:2
2) 4:4
3) 2:6
4) 3:5

http://shenndesigns.weebly.com/my-physical-trait---curly-hair.html

half of each assuming no one has only a little curly so 4:4

2) 4:4

4:4. CCxcc

The ratio is 6:2=3:1.Dominant one is curly hair.

To determine the ratio of curly-haired to straight-haired children in this scenario, we need to consider the genetic inheritance of hair type.

Hair type is determined by genes inherited from both parents. In this case, the mother has curly hair (which is controlled by a gene for curly hair) and the father has straight hair (which is controlled by a gene for straight hair). Hair type is believed to be controlled by multiple genes, so it can be a bit more complicated than a single gene inheritance, but for the purpose of this explanation, let's assume it is controlled by a single gene.

The gene for curly hair (C) is considered dominant, while the gene for straight hair (c) is recessive. This means that if the child inherits at least one copy of the curly hair gene (C), they will have curly hair. Only if the child inherits two copies of the recessive straight hair gene (cc) will they have straight hair.

Now, let's consider the possible combinations of the parents' genes and analyze the possible outcomes for their children:

Curly-haired mother (CC or Cc) x Straight-haired father (cc):

1) If the mother is homozygous dominant (CC) and the father is homozygous recessive (cc), the children will all have curly hair (Cc).

2) If the mother is heterozygous (Cc) and the father is homozygous recessive (cc), there is a 50% chance the children will have curly hair (Cc) and a 50% chance they will have straight hair (cc).

Therefore, the most likely ratio of curly-haired to straight-haired children would be 1) 6:2 (if the mother is CC) or 2) 4:4 (if the mother is Cc).

So, the correct answer would be either 1) 6:2 or 2) 4:4, depending on the mother's genotype.