Zygote

A couple is discussing their future child. One person believes the child's genetic traits, such as eye color and hair color, are established gradually over the first few weeks of development. The other person believes these traits are set at a single, specific moment. Based on the biological process that initiates pregnancy, which statement is most accurate?

A couple is learning about the earliest stages of human development. They want to pinpoint the specific biological event where the genetic material from both parents first combines to create a new, unique, single-celled organism. Which of the following events correctly identifies this moment?

Genetic Determination in a Zygote