What objects did scientists use to help determine the age of the Earth? *

How do scientists determine the age of the Earth?

The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientists calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years.

https://www.livescience.com/32321-how-is-earths-age-calculated.html

the best estimate for earth age is based on radiometric dating of fragment from the canyon dialo iron meteorite from the fragments scientist calculated the relative abundance of element that's for maid as radioactive Uranium decayed over billion of years

You can tell it's not a dominant trait because it would show in all the grandchildren.
 
 Recessive
 #12 is heterozygous