Adaptions and DNA

Question 1

What is meant by the word “population”?

Answer 1

All the members of a single species that live in a habitat

Question 2

Which of the following do plants not compete for?

Answer 2

Plants do not compete for food.

Question 3

Why are polar bears white?

Answer 3

To camouflage them so their prey cannot see them

Question 4

who discovered DNA?

Answer 4

Rosalind franklin ands watson and crick

Question 5

Who produced the first X-ray pictures of DNA?

Answer 5

franklin

Question 6

Which of these is smallest?

Answer 6

gene

Question 7

Where are chromosomes found?

Answer 7

in the nucleas

Question 8

Which two scientists discovered the shape of DNA?

Answer 8

watson and crick

Question 9

what shape is dna?

Answer 9

double helix

Question 10

How many chromosomes do normal body cells have?

Answer 10

23 pairs

Question 11

How many chromosomes do sperm and eggs have?

Answer 11

23 chromosomes

Question 12

What is the definition of a gene?

Answer 12

A section of DNA that gives a characteristic

Question 13

How many genes do we have?

Answer 13

23

Question 14

What are chromosomes?

Answer 14

Chromosomes are long coiled up lengths of DNA .

Question 15

Can you get variation within a species?

Answer 15

Yes - plants or animals with inherited genes can even have different characteristics.

Question 16

What two things can cause characteristic features?

Answer 16

Genes- if they are inherited

environment - surroundings

Question 17

How can scientists help to manatin biodiversity?

Answer 17

Scientists can store the genes of different species in gene banks so that scientists might be able to create new members of extinct species in the future. They can also prevent the structure of habitats.

Question 18

What are the two different classes of variation?

Answer 18

Continuous variation - meaning a feature can vary over a range of values.
Discontinuous - meaning can only take ceartain values.

Question 19

What is a habitat?

Answer 19

An area where an organism lives.

Question 20

Give the meaning of endangered.

Answer 20

At risk of becoming extinct

Question 21

Explain why a change in the environment could lead to a species becoming extinct?

Answer 21

If the environment changes they may become less well adapted. So an organism may find it harder to compete for the recources it needs to survive and reproduce. If this happens to the whole species it could become extinct.