9Aa

Question 0

what is variation?

Answer 0

Differences between organisms

Question 1

What is Characteristics?

Answer 1

features of the organisms that can be both inherited or caused by environment

Question 2

What does the nuclei contain?

Answer 2

chromosomes

Question 3

what is chromosome?

Answer 3

huge molecule of DNA found inside the nucleus of a cell

Question 4

What are genes?

Answer 4

section of a chromosome that controls the inherited characteristics of an organism

Question 5

What do genes carry?

Answer 5

genetic informations, which is the instructions that control your characteristics

Question 6

What are the two names of a cell used for sexual reproduction

Answer 6

sex cells

gametes

Question 7

what do gametes do?

Answer 7

they transfer genes from parents to offspring

Question 8

How many chromosomes do the nuclei of gametes contain?

Answer 8

half the chromosomes of normal cells(23)

Question 9

Explain the process of reproduction

Answer 9

1. fertilisation
   one sperm cell enters an ovum(egg cell)
   two nuclei fuse to form a complete set of genes (fertilised egg cell)
2. cell division
   fertilised egg cell grows by spliting into 2,forming embryo. cells continue to divide to form a ball of cells, then into an organism

Question 10

What is mutation?

Answer 10

changes in genes which often alters the instruction that the gene carries

Question 11

What is hybrid?

Answer 11

offspring of parents from 2 different species

Question 12

What is an allele?

Answer 12

different versions of the same gene

Question 13

what is a zygote?

Answer 13

fertilised egg cell

Question 14

example of genetic disease?

Answer 14

cystic fibrosis

Question 15

punnet square?

Answer 15

model used to work out how likely is that certain combinations of alleles will be inherited

Question 16

how do non identical and identical twins form?

Answer 16

non-identical: 2 egg cells each fertilised by different sperm cells
identical: fertilised egg cell splits into 2