inheritance, variation and evolution

Question 1

Cystic fibrosis is caused by

Answer 1

recessive alle genetic disorder of the cell membrane

Question 2

Cystic fibrosis results in

Answer 2

in the body producing a lot of thick sticky mucus in the air passages and pancreas

Question 3

Alle which causes cystic fibrosis

Answer 3

is a recessive ‘f’ carried by .
about 1 person in 25

Question 4

Polydactyle is caused

Answer 4

by a dominant alle

Question 5

Polydactyle is a

Answer 5

genetic disorder where a babies born with extra fingers and toes and does not have any affect on their health .

Question 6

Embryos

Answer 6

can be screen for genetic disorders such as Cystic fibrosis

Question 7

Variation

Answer 7

can be genetic - caused by different Genotype

Question 8

Genotype

Answer 8

is all of the genes and alleles that an organism has

Question 9

An organisms genotype affects

Answer 9

its phenotype - the characteristic that it displays

Question 10

Mutations

Answer 10

is a rare, random change in an organisms DNA that can be inherited

Question 11

Mutations occur

Answer 11

continuously .

Question 12

Mutation means

Answer 12

that the gene is altered which produces a genetic variant .

Question 13

The genetic disorder cystic fibrosis

Answer 13

is causes by a mutation that has a huge effect on phenotype

Question 14

Theory of evolution

Answer 14

all of today’s species have evolved from simple life forms that first started to develop over three billion years ago

Question 15

Charles Darwin

Answer 15

came up with a theory about evolution called evolution by natural selection

Question 16

Darwin knew

Answer 16

organisms in a species show wide variations in their characteristics and that organisms have to compete for limited resources in ecosystem

Question 17

He concluded that the organisms with the most suitable characteristics for the environment would be successful

Answer 17

and more likely to reproduce and pass on genes for their characeristics that made them successful to their offspring

Question 18

The discovery of genetics supported Darwin’s idea

Answer 18

it provided an explanation of how organisms born with beneficial characteristics can pass them on .

Question 19

Development of new species

Answer 19

is called speciated

Question 20

Genetic diagrams

Answer 20

Punnet square which show 50:50 probability of having a boy or a girl when pregnant.

Question 21

23 pairs of chromosomes

Answer 21

In every human body

Question 22

22 of the 23 pairs of chromosomes

Answer 22

Are matched pairs of chromosomes that just control characteristics.

Question 23

23rd pair of chromosome

Answer 23

Are labelled XY or XX . These decide your sex

Question 24

Males have an X and a Y chromosome

Answer 24

Y causes male characteristics

Question 25

Females had two X chromosomes

Answer 25

The XX combination allows female characteristics to develop