Please discuss the fitness advantage associated with aiding a related or even an unrelated individual with producing offspring. Please give examples.

Egg laying in fruit flies can be triggered (induced) when males transfer their sperm to females. Which of the following is a selective advantage of induced egg laying for the male flies? Less time and energy is expended by the male. The males do not have to produce as much sperm. More eggs can be fertilized. A male fly's sperm is more likely to be used for fertilization. Submit Request Answer

Male California sea lion mating success is determined by the number of mates they can acquire. Larger males are more successful at maintain larger territories. Females remain in one territory for the duration of the mating season and larger territories support more females than smaller territories. Additionally, the most successful males will fast during mating season to remain present in their territory at all times. If they leave to hunt they risk loss of their territory and access to all the females present in it. Which of the following best describes sexual selection in this species?   a. Males likely engage in male-male combat to maintain territories.   b. Intersexual selection is likely stronger than intrasexual selection.   c. Sexual selection on the females is stronger than on the males.   d. Females will mate with smaller males at a higher frequency than larger males

Are the following primates (same species) exhibiting sexual dimorphism? Explain your reasoning:

Define sexual selection and describe an example of intersexual and intrasexual sexual selection in animals. Be sure to detail what trait(s) is/are being sexually selected.

What is the difference between prezygotic and postzygotic reproductive isolating mechanisms? List some different types of each.

Which statement below is FALSE regarding the differences between sea urchin and mammals? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a External fertilization is observed in sea urchins, whereas internal fertilization is used in mammals. External fertilization is observed in mammals, whereas internal fertilization is used in sea urchins. Urchins produce thousands of eggs, whereas humans produce only one egg that when fertilized becomes a zygote. Once sea urchins release their gametes, they move on to feeding on other normal activities and do not worry about their progeny at all. Unanswered A Submit

Polygyny is a common mating system in nature. Which one of the following scenarios is LEAST likely to result in a polygynous mating system? Male stalk-eyed flies form leks where receptive females come visit Male Neotropical giant damselfly defend water-filled tree holes, which are the oviposition sites for females. Suitable tree holes for oviposition are rare and females must mate with the resident male in exchange for access to the oviposition sites. Male Bengal tigers defend large territories that contain food sources. Female Bengal tigers visit male territories to mate. The density of the Bengal tiger is extremely low that male tigers rarely encounter more than one female in their lifetime. In the bumblebee-wolf Philanthus bicinctus, females are unreceptive until they finish constructing the long underground burrow as nest sites. Males search for locations containing a number of newly constructed burrows and attempt to control these sites against the intruders. Your cousin Peter…

Identify whether each of the following scenarios is an example of intersexual or intrasexual selection (. a) Male bison fight each other for access to females L Select ] b) Female Birds of Paradise visit many different males to decide which male has the best dance [ Select ] c) Female jacanas defend their mates from other females [Select ] d) Male seahorses prefer to mate with larger females [ Select ] e) Female cicadas prefer males who provide the largest spermatophores [ Select ]

According to the figure for oppossums Birth Age (months): 0 Energy source: Energy used for: Baby Juvenile Maturity Adult Killed by predator 1st litter 2nd litter Independence (8 pups) (7 pups) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Mother Gathered by self Growth, metabolism, and repair Metabolism, repair, and reproduction delayed maturation = longer growth = larger litters early maturation = shorter growth = larger litters early maturation = shorter growth = fewer litters delayed maturation = longer growth = more litters