DNA and Evolution

Question 1

Describe the structure of DNA

Answer 1

The structure of DNA is a chemical made up of two long strands, arranged in a spiral. This is the double-helix structure.

Question 2

What is the relationship between chromosomes, DNA ,genes, genetic information, and nuclei

Answer 2

Cell
⬇️
Nucleus (found inside the cell)
⬇️
Chromosomes (found inside the nucleus)
⬇️
DNA (makes up the chromosomes)
⬇️
Genes (small sections of DNA)
⬇️
Genetic Information (instructions in the genes that control traits)

Question 3

What are 3 types of INHERITED variation?

Answer 3

• Hair color
• Eye color
• Floppy earlobes

Question 4

How does sexual reproduction cause inherited variation?

Answer 4

Offspring inherit one set of chromosomes from each parent. So, an offspring has a mixture of chromosomes (and alleles) from its two parents, resulting in genetic variation.

Question 5

Genetic cross.

Answer 5

A | a
—————-
A | AA | Aa
a | Aa | aa

Question 6

If you have a Capital A and a lowercase a, where A is the dominant trait, can you still pass on the recessive allele?

Answer 6

Yes.

Question 7

What is the only time when you can see the Recessive trait?

Answer 7

When there are only Recessive alleles.

Question 8

Which two cells pass on information from parents to their children?

Answer 8

Egg cell and Sperm cell.

Question 9

How do organisms become endangered or extinct?

Answer 9

When a species is unable to adapt to changes in the environment, it can become extinct naturally.