Question
The graph shows variations in beak size for the bird Geospiza fortis on an island in the Galápagos archipelago.
What evidence from the graph indicates that disruptive selection is occurring?
A. An intermediate beak size is less common.
B. Median beak size is the most common.
C. Smaller beaks are favoured.
D. Larger beaks are favoured.
▶️Answer/Explanation
Ans:A
Question
What can lead to reproductive isolation after just one generation?
A. Polyploidy
B. Increased mutation rate
C. Changed allele frequencies
D. Independent assortment of chromosomes
▶️Answer/Explanation
Ans:A
Question
The genetic determination of dogs’ coats can be quite complex, with many different genes acting at the same time.
• The dominant allele E gives brown tones. The recessive allele e results in red tones.
• The colour intensity is due to another gene. The dominant allele B gives a dark colour, whereas the recessive allele b results in a light colour.
What would be the genotype of a light brown dog produced from a cross between a dark brown dog and a light red dog?
A. EEbb
B. EeBb
C. eeBb
D. Eebb
▶️Answer/Explanation
Ans:D
Question
How do the concepts of gradualism and punctuated equilibrium differ?
A. The timing of evolution
B. The mechanism causing evolution
C. The sequence of evolutionary events
D. The reality of evolution
▶️Answer/Explanation
Ans:A