The way by which the conjoined twins are formed during the early stages of development. Introduction: Twins can be defined as the multiple births that are estimated to occurs once in 90 births. There are rare cases of sextuplets or septuplets (six or seven newborns at once), which occur as result of fertility drugs usage. The occurrence of natural triplets is also rare, that is, 1 in 8,000 births.

Question

Want to see the full answer?

Answer 1

Question

Chapter 21, Problem 2AWK

Summary Introduction

To review:

The way by which the conjoined twins are formed during the early stages of development.

Introduction:

Twins can be defined as the multiple births that are estimated to occurs once in 90 births. There are rare cases of sextuplets or septuplets (six or seven newborns at once), which occur as result of fertility drugs usage. The occurrence of natural triplets is also rare, that is, 1 in 8,000 births.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

Alex is newly pregnant with twins and curious about everything about her developing children. Her doctor was able to tell her that her twins are dizygotic twins via ultrasound. In your essay, describe the difference between monozygotic and dizygotic twins and explain how each is conceived. Alex is also wondering about the genetics of her children and how they will act when they are older. Offer an explanation of genotype and phenotype and provide an example of each specific to Alex’s future children being dizygotic twins. Finally, in your previous explanation be sure to also describe how most traits are both polygenic and multifactorial and how that may influence her twins’ phenotypes.

Based on the research of developmental theorists, do you feel that repeatedly soothing an infant is beneficial or detrimental to development? Why or why not?

It is a basic idea of human biology, taught in grade schools everywhere: Identical twins come from the same fertilized egg and share identical genetic profiles. But according to new research, though identical twins share very similar genes, identical they are not. The discovery opens a new understanding of why two people who hail from the same embryo can differ in phenotype (physical characteristics), as biologists refer to a person’s physical manifestation. The new findings appear in the March issue of The American Journal of Human Genetics, in a study conducted by scientists at the University of Alabama at Birmingham and universities in Sweden and the Netherlands. The scientists examined the genes of 10 pairs of monozygotic, or identical, twins, including 9 pairs in which one twin showed signs of dementia or Parkinson’s disease and the other did not. It has long been known that identical twins develop differences that result from the environment. And in recent years, it has also…