Why is a large number of sperm needed to ensure that ...

[rayancarla1]

Why is a large number of sperm needed to ensure that fertilization occurs?
 
  What will be an ideal response?

Question 2

Many species of plants and animals have now been genetically ___________________ __, which means that scientists have located where each gene is located on the chromosomes.
 
  Fill in the blank(s) with correct word

[Cheesycrackers]

Answer to Question 1

Many sperm are needed for fertilization for two reasons. First, not all sperm are hardy enough to make the long trip to the oviduct where the egg is. Therefore, a large number of sperm are needed to ensure that some sperm reach the right destination. Second, even though only one sperm penetrates and fertilizes the egg, many sperm are needed to swarm around the egg and secrete an enzyme that loosens the cells surrounding the egg.

Answer to Question 2

mapped

[rayancarla1]

Wow, this really help

[TheNamesImani]

Thanks for the timely response, appreciate it