Diverstity Amd Selectiom Flashcards Preview

Biology AS > Diverstity Amd Selectiom > Flashcards

Flashcards in Diverstity Amd Selectiom Deck (13):
1

Do gametes have a haploid or diploid number of chromosomes

Haploid

2

What is the haploid number for humans

23

3

In sexual reproduction two gametes join together at fertilisation to form a what?

Zygote

4

Name two examples of gametes

Egg
Sperm

5

Is a zygote diploid or haploid

Diploid

6

What is crossing over

During meiosis, homologous chromosomes pair up. The chromatids twist around each other and bits of chromatids swap over

7

In mitosis do the cells produced have the same number of chromosomes as the parent cell or half the number of chromosomes??

The same

8

In meiosis do the cells produced have the same number of chromosomes as the parent cell or half the number of chromosomes??

Half

9

In mitosis how many daughter cells are made

2

10

In meiosis how many daughter cells are produced

4

11

What is the order of classification

Domain
Kingdom
Phylm
Class
Order
Family
Genus
Species

12

What is a genetic bottleneck

An event that causes a big reduction in a pollination.
This reduces the number of different alleles in a gene pool and so reduces genetic diversity

13

Normal body cells have the diploid number what does this mean

Each cell contains two of each chromosome, one from the mum and one from the dad