In the Cretaceous period, Mesozoic Era forests begin to look like modern day forests and included a variety of conifers and decidous trees.
Explanation:
The Cretaceous period was the last and longest segment of the Mesozoic Era.It lasted approximated 79 million years from the minor extinction events that closed the Jurassic Period about 145.5 million years ago to the Cretaceous - Palogene ( K-Pg) extinction event dated at 65.5 million years ago. This era have seen more dinosaurs than before.The horned Cretaceous dinosaurs appeared, like the Triceratops and Centrosaurus. The armored Ankylosaurus, duckbilled Parasaurolophus, and large carnivore Tyrannosaurus were a few of the quickly evolving dinosaurs.
Hardy Weinberg Equilibrium formula for allelic frequency is:
Hardy Weinberg Equilibrium formula for genotypic frequency is:
Here,=frequency of dominant allele
=frequency of recessive allele
=frequency of dominant genotype
=frequency of recessive genotype
=frequency of heterozygous genotype
frequency of affected individuals=0.0004(given)
here,affected individuals means the one's having Cystic Fibrosis and since it is recessive disease so we can write frequency of recessive genotype as: =0.0004
If =0.0004 will be 0.02;frequency of recessive allele will be 0.02