Chap20

Question 1

Genotype

Answer 1

Combination of alleles inherited

Question 2

Phenotype

Answer 2

Observable characteristics

Question 3

Discontinuous variation

Answer 3

Distinct groups

Question 4

Continuous variation

Answer 4

Variation possible from one extreme to another

Question 5

Genetic variation

Answer 5

Meiosis or genetic reproduction
(Random fusion in fertilisation)

Question 6

Environmental variation

Answer 6

Diet or chlorosis or disease

Question 7

Codominance

Answer 7

Two different alleles occur for a gene

Question 8

Sex linkage

Answer 8

Characteristics determined by genes on sex chromosome

Question 9

Dihybrid inheritance

Answer 9

Inheritance of two different characteristics from two pairs of homologous chromosomes

Question 10

Autosomal linkage

Answer 10

Two or more genes on same autosome

Question 11

Recombinant frequency

Answer 11

Number of recombinant offspring / total number of offspring

Question 12

Epistasis

Answer 12

One gene affects expression of another gene to determine phenotype

Question 13

Founder effect

Answer 13

Extreme genetic drift
Display less genetic variation
Smaller gene pool

Question 14

Allopatric speciation

Answer 14

Physical barrier separates population from the rest of the group
Selection pressures

Question 15

Sympatric speciation

Answer 15

Within a population that share same habitat

Question 16

Polymorphic

Answer 16

More than one phenotype displayed