Question 1

Which of the following best explains why the chicken and human embryos both have pharyngeal pouches and tails during early development, as shown in the first image?

Accepted Answer

Both species share a recent common ancestor, and these structures are evidence of their evolutionary relationship.

Question 2

The second image shows the forelimbs of a bat, porpoise, and human. What is the evolutionary significance of the similarities in bone structure among these species?

Accepted Answer

They are homologous structures, indicating descent from a common tetrapod ancestor.

Question 3

Based on the DNA similarity chart in the third image, which statement is most accurate?

Accepted Answer

Humans share a higher percentage of DNA with chimpanzees than with gorillas or old world monkeys.

Question 4

The phylogenetic tree in the fourth image shows the evolutionary relationships among primates. Which group is most closely related to humans?

Accepted Answer

Chimpanzees and bonobos

Question 5

What is the main difference between the reproductive strategies shown in the fifth and sixth images (primate and dog pregnancies)?

Accepted Answer

Primates have longer gestation periods and typically give birth to fewer, more developed offspring compared to dogs.

Question 6

The seventh and eighth images show a bat and a dolphin. What do these animals have in common that is significant for mammalian evolution?

Accepted Answer

Both are eutherian mammals, meaning they give birth to live, well-developed young after a placental gestation.

Question 7

The ninth image shows a diverse group of humans. Which statement best reflects current scientific understanding of human genetic diversity?

Accepted Answer

There is more genetic variation within so-called 'racial' groups than between them.

Question 8

The map in the tenth image shows the distribution of the sickle cell allele. What evolutionary process explains the high frequency of this allele in certain regions?

Accepted Answer

Natural selection due to malaria resistance in heterozygotes.

Question 9

The pedigree in the eleventh image tracks a genetic trait through three generations. If the trait is recessive, what is the probability that two heterozygous parents (Aa x Aa) will have a child with the trait?

Accepted Answer

$$\frac{1}{4}$$

Question 10

The twelfth image illustrates pleiotropy. Which of the following is an example of pleiotropy?

Accepted Answer

A single gene causing both sickle cell anemia and resistance to malaria.

Question 11

The thirteenth image shows polygenic inheritance. Which trait is most likely to be influenced by polygenic inheritance?

Accepted Answer

Human height

Question 12

The fourteenth image shows the distribution of student heights. What does the bell-shaped curve indicate about the trait?

Accepted Answer

Height is a quantitative trait showing continuous variation.

Question 13

The fifteenth image shows a correlation between parent and offspring traits in birds. What does a strong positive correlation suggest about the trait?

Accepted Answer

The trait has high heritability.

Question 14

The sixteenth image shows two types of twins. Which statement is correct regarding monozygotic and dizygotic twins?

Accepted Answer

Monozygotic twins are genetically identical, while dizygotic twins share about 50% of their genes.

Question 15

The seventeenth image shows a mouse experiment with different diets. What does this experiment demonstrate about heritability?

Accepted Answer

Environmental factors can cause differences in traits even when genetic backgrounds are identical.

Question 16

The eighteenth image shows the effects of obesity on different body systems. Which of the following is NOT a health risk associated with obesity?

Accepted Answer

Increased risk of sickle cell anemia

Question 17

The nineteenth image shows three types of obesity. Which type is most likely to involve the greatest number of genes?

Accepted Answer

Common obesity

Environment and Behaviour Traits: Human Variation, Evolution, and Quantitative Genetics

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