How to distinguish single eyelids in newborns

For children, it is impossible to tell whether they have double eyelids or single eyelids when they are just born. For many mothers, they hope that their babies will grow up to be very beautiful and have a pair of beautiful big eyes. So how to tell whether a newborn has single eyelids or double eyelids? In fact, the distinction can be made through genetic factors. Double eyelids are dominant, while single eyelids are recessive. If both parents have single eyelids, then the child will generally also have single eyelids.

1. Whether a baby has single or double eyelids is determined by the genes of the parents

Biology believes that double eyelids are absolutely dominant, while single eyelids are recessive, so the genetic factors of double eyelids are more likely to show up on the surface of every baby. If both parents have single eyelids, the child will generally also have single eyelids.

If both parents have double eyelids, generally speaking, the child should also have double eyelids, but occasionally the child may have single eyelids. The reason for this situation is because it involves the issue of dominant genes and recessive genes, which is the same as when a couple with type A and type B blood give birth to a child with type O blood. In other words, even though both parents have double eyelids, they both carry the genetic genes for single eyelids. When the single eyelid genetic factors from both parties pair up, the child will also have single eyelids.

AA+AA means both parents carry the dominant gene for double eyelids, then the child's gene will be AA, that is, double eyelids; AA+Aa means one of the parents has the recessive gene for single eyelids, then the child's gene will be AA or Aa, and still have double eyelids; Aa+Aa means both parents carry the recessive gene for single eyelids, then the child's gene may be AA, Aa, aa, which means the baby may have double eyelids or single eyelids. If CC represents the wild type, CA represents the heterozygous mutant genotype, and AA represents the homozygous mutant genotype.

2. Implicit Model:

AA VS (CA+CC); Dominant model: (CA+AA) VS CC; Additive model: AA VS CC Overdominant model: (CC+AA) VS CA. Codominant model: AA VS CA VS CC; 1. How to determine wild type and variability: look at the number of homozygous genotypes in the research object, eg: CC is 200 and AA is 100, then AA is a homozygous variant (the one with fewer genotypes is a variant); 2. What is additivity: It is a comparison between homozygotes 3. Determination of the genetic model (which genetic model it belongs to): Use Logistic regression analysis to look at the OR value, 95% confidence interval and P value. If the value 1 is not within the confidence interval and the P value is less than 0.05, it is a meaningful genetic model.