additional qs I got wrong

Question 1

why did Darwin not explain how new species actually arise?

Answer 1

he lacked an understanding of genetics

Question 2

what is a genetic marker?

Answer 2

a gene used to study a biological process

Question 3

genes for heavy metal tolerance occur at very low frequencies in uncontaminated pastures. why don’t genes for heavy metal tolerance spread in uncontaminated pastures?

Answer 3

they reduce the competitive ability of heavy metal tolerant plants

Question 4

how did Darwin discover inbreeding depression?

Answer 4

by comparing the viability and fertility of plants resulting from artificial cross-fertilisation and self-fertilisation