DNA and inheritance

Question 1

What is a nucleus made of?

Answer 1

Nucleus contains chromosomes(X shaped)
Chromosomes made of genes that control characteristics
Genes are made of DNA

Question 2

His many chromosomes in sperm cells, human and egg cells

Answer 2

Human cells:46
Sperm and egg:23 each

Question 3

What is the structure of DNA

Answer 3

2 chains wound together and makes a double helix structure.

Question 4

Who discovered the structure of DNA

Answer 4

Watson and crick

Question 5

Define variation

Answer 5

Variation within a species (e.g. humans) due to different characteristics expressed by genes. Characteristics can be inherited or enviromental

Question 6

Continuous and discontinuous variation

Answer 6

Continuous can have a range of different values (e.g. height) and discontinuous variation can take certain values (e.g. blood group or eye color)

Question 7

Describe the process of natural selection

Answer 7

If there where 2 giraffes, one with The characteristics of a longer neck and one with a shorter neck, the one with a longer neck would survive longer as it can reach its food, while the other one dies earlier as it can’t react the top of the trees. This means that the giraffe with the longer neck will be able to reproduce and more giraffes will have longer necks