DP Biology (last assessment 2024)

Test builder »

Question 18N.2.HL.TZ0.b

Select a Test
Date November 2018 Marks available [Maximum mark: 5] Reference code 18N.2.HL.TZ0.b
Level HL Paper 2 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 5]
18N.2.HL.TZ0.b

Outline the causes of variation in one example of continuous variation in humans.

[5]

Markscheme

a. height/skin colour/other valid example ✔

b. with continuous variation any level of the variable/phenotype is possible/OWTTE ✔

c. polygenic inheritance/combined effect of more than one gene on the trait ✔

d. additive effects on the trait of alleles of multiple genes/OWTTE ✔

e. histogram showing effects of alleles of multiple genes ✔

f. environment «may» also affect the trait/sunlight affects skin colour/other example ✔

g. normal distribution curve drawn or described to show typical pattern with continuous variation ✔

Syllabus sections