Female Pacific walruses migrate north each summer and return south to mate with the males before the ice freezes in winter. Females mate once every two years because of a 15-month gestation period. Those females pregnant from the previous mating season do not participate in the mating rituals. Does the life history skew the OSR toward males, females, or neither sex? When male and female flamingos reach sexual maturity, they pair for life. The pair builds the nest together and takes turns incubating the egg. After the chick hatches, both parents provide crop milk from a gland in the digestive system until the chick can feed on its own. Does the life history skew the OSR toward males, females, or neither sex?
Female Pacific walruses migrate north each summer and return south to mate with the males before the ice freezes in winter. Females mate once every two years because of a 15-month gestation period. Those females pregnant from the previous mating season do not participate in the mating rituals. Does the life history skew the OSR toward males, females, or neither sex? When male and female flamingos reach sexual maturity, they pair for life. The pair builds the nest together and takes turns incubating the egg. After the chick hatches, both parents provide crop milk from a gland in the digestive system until the chick can feed on its own. Does the life history skew the OSR toward males, females, or neither sex?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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All blanks have three options. Males, females, or neither.
Transcribed Image Text:The operational sex ratio (OSR) is he ratio of males to females available for mating. Identify each life history as more likely
leading to an OSR skewed toward males or females.
Female Pacific walruses migrate north each summer and return south to mate with the males before the ice freezes in
winter. Females mate once every two years because of a 15-month gestation period. Those females pregnant from the
previous mating season do not participate in the mating rituals.
Does the life history skew the OSR toward males, females, or neither sex?
When male and female flamingos reach sexual maturity, they pair for life. The pair builds the nest together and takes turns
incubating the egg. After the chick hatches, both parents provide crop milk from a gland in the digestive system until the
chick can feed on its own.
Does the life history skew the OSR toward males, females, or neither sex?
Transcribed Image Text:Female seahorses produce nutrient-rich eggs that they competitively deposit in the pouches of receptive males. The eggs
are fertilized within the male's pouch, where they are nurtured and protected for up to 45 days in some species, until the
tiny offspring hatch and emerge from the pouch.
Does the life history skew the OSR toward males, females, or neither sex?
Female jacanas that hold territories commonly mate with up to four males each. Females may lay a new egg every nine
days, depositing them in nests built by the males. The eggs hatch after about a month, and the newly hatched young leave
the nest and follow the male to good foraging spots.
Does the life history skew the OSR toward males, females, or neither sex?
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