Ch. 9 - Reproduction

Question 1

This is the process of egg cell production

Answer 1

Oogenesis

Question 2

This is the process of sperm cell production

Answer 2

Spermatogenesis

Question 3

What are two groups of mammals that lack a baculum?

Answer 3

Humans and cetaceans

Question 4

This is spontaneous in most mammals

Answer 4

Ovulation

Question 5

This type of ovulation only occurs after copulation

Answer 5

Induced

Question 6

What are three examples of mammals that use induced ovulation?

Answer 6

Rabbits, desert rodents, squirrels

Question 7

This is a period of receptivity before and after ovulation

Answer 7

Estrous

Question 8

This is the physical separation of young from their mother

Answer 8

Parturation

Question 9

This type of offspring is fully-haired, well-developed, and can forage/flee/swim shortly after birth

Answer 9

Precocial young

Question 10

This type of offspring are helpless at birth

Answer 10

Altricial young

Question 11

Which has longer gestation period: precocial or altricial young?

Answer 11

Precocial

Question 12

Which has a shorter infancy after birth: precocial or altricial young?

Answer 12

Altricial

Question 13

Do most mammals have precocial or altricial offspring?

Answer 13

Altricial

Question 14

What are two examples of mammal groups that have precocial offspring?

Answer 14

Ungulates and marine mammals

Question 15

This process typically only happens in females and begins immediately following parturation

Answer 15

Lactation

Question 16

What are the four main non-water components of mammal milk?

Answer 16

Fats, protein, lactose, colostrum

Question 17

In this reproductive strategy, ovulation can happen long after copulation

Answer 17

Delayed fertilization

Question 18

What are three advantages of delayed fertilization?

Answer 18

Reduces stress during torpor through cold months; early seasonal fertilization; can be synchronized with food availability

Question 19

What is a disadvantage of delayed fertilization?

Answer 19

Longer pre/postnatal development

Question 20

In this reproductive strategy, copulation and fertilization occur normally, but the blastocyst floats freely in the uterus

Answer 20

Delayed implantation

Question 21

What are five examples of mammals that use delayed implantation?

Answer 21

Armadillos, bears, seals, mustelids, Old World deer

Question 22

What is the advantage of delayed implantation?

Answer 22

None known

Question 23

This mammal undergoes monozygotic polyembryony

Answer 23

Armadillo

Question 24

In this reproductive strategy (common in marsupials), later fertilizations are arrested until the first offspring leaves the pouch

Answer 24

Embryonic diapause