Biology Topic 15

Question 1

Carrier

Answer 1

A heterozygote that has the allele for a recessive trait but does not show the trait

Question 2

Monogenetic Traits

Answer 2

Variation that occurs due to the action of different alleles of a single gene

Question 3

Polygenetic Traits

Answer 3

Variation that is caused by the action of two or more genes at different loci

Question 4

Epigenetics

Answer 4

All changes to genes, apart from changes to base sequences, which bring about phenotypic changes

Question 5

Natural Selection

Answer 5

Variation in characteristics within a species
Differential survival- a selective pressure kills off those without the necessary characteristic
Genetic Inheritance- the new individuals have a selective advantage and reproducing, passing the new characteristic to all future generations
With time the frequency of these individuals increases resulting in a change of population over time

Question 6

Genotype

Answer 6

The double set of genetic instructions in a diploid organism and the genetic makeup of an organism at one particular locus.

Question 7

Phenotype

Answer 7

Expression of an organism’s genotype in its structural, physiological and biochemical characteristics