20 Kw

Question 1

Chlorosis

Answer 1

Lack or chloro Reduces plants ability to make food by photo. Leaves look pale or yellow because cells not making normal amount of chlorophyll

Question 2

Genotype

Answer 2

Genetic make up of an organism in respect of that gene

Question 3

Phenotype

Answer 3

The observable characteristics of a an organism

Question 4

Homozygous

Answer 4

Two identical alleles for a characteristic

Question 5

Heterozygous

Answer 5

Two diff alleles for the same characteristics

Question 6

Dominant Allele

Answer 6

The version of the gene that will always be expressed if present

Question 7

Recessive allele

Answer 7

The version of the gene that will be expressed if two copies of the alleles are present

Question 8

Codominance

Answer 8

When two alleles of equal dominance occur for a gene. Both are expressed

Question 9

Sexlinked genes

Answer 9

Characteristic determined by genes carried on the sex chromosome

Question 10

Autosomal linkage

Answer 10

Linkage that occurs on the other 22 pairs. Inherited as one unit. No independent assessment during meiosis unless alleles separated by chiasmara

Question 11

Epistasis

Answer 11

Interaction of genes at different loci.

Question 12

Dominant episasis

Answer 12

Dominant allele results in the gene having an effect on another gene

Question 13

Episatic

Answer 13

A gene that affects the expression of another grne

Question 14

Hypostatic

Answer 14

A gene that is affected by other gene

Question 15

Gene pool

Answer 15

Sum of all in the genes in a pool of a population in a given time

Question 16

Allele frequency

Answer 16

The relative frequency of a particular allele in a population

Question 17

Gene flow

Answer 17

The movement of alleles between population. Immigration and emigration result in the changes in allel frequency

Question 18

Genetic drift

Answer 18

The hange in allele frequency due to the random nature of mutations. Incl founders effect

Question 19

Density dependant factor

Answer 19

Dependant on pop size and include .comp predation

Paracitism communicable disease

Question 20

Density independant factor

Answer 20

Affect pop of all size

Question 21

Founder effect

Answer 21

The arising of a small pop due to establishment of new colonies by a few isolativrd individuals

Question 22

Stabilising selection

Answer 22

The norm is selected for

Extremes selected against

Question 23

Directional selection

Answer 23

Change in environment and The norm is no longer advantageous
Less common extreme phenotype are positively selected

Question 24

Disruptive selection

Answer 24

Extreme selected for and nrorm selected against

Question 25

Speciation

Answer 25

Formation of a new species through evolution

Question 26

Allopatric

Answer 26

Separation by physical barriers

Question 27

Sympatric

Answer 27

Populations share the same habitat . Two species interbreed to make a hybrid with a different number of chromosomes to either parent stopping gene flow and isolation the hybrid