Chart 13.1

Question 1

Individuals from different species do not come in contact with each other

Answer 1

Spatial isolation

Question 2

Polar bear (arctic) and spectacled bear (South America) never encounter each other in natural settings.

Answer 2

Spatial isolation

Question 3

Ritual behaviors that prepare partners for mating are different in different species.

Answer 3

Behavioral

Question 4

Many birds with predating songs or “dance” will not mate with individuals who do not know the ritual

Answer 4

Behavioral

Question 5

Sex organs are incompatible between different species, so sperm cannot reach egg.

Answer 5

Mechanical

Question 6

Many insects with “lock-and-key type genitals physically prevent sperm from contacting eggs of a different species

Answer 6

Mechanical

Question 7

Proteins on egg that allow sperm binding do not bind with sperm from another species.

Answer 7

Gamete incompatibility

Question 8

Animals with external reproduction, such as sponges, have specific proteins on their eggs that will bind only to sperm from the same species.

Answer 8

Gamete incompatibility

Question 9

Zygote cannot complete development because genetic instructions are incomplete

Answer 9

Hybrid inviability

Question 10

A sheep crossed with a goat can produce an embryo, but the embryo dies in the early development stages.

Answer 10

Hybrid inviability

Question 11

Hybrid organism cannot produce offspring because chromosome number is odd.

Answer 11

Hybrid sterility

Question 12

Mules

Answer 12

Hybrid sterility