produces more, but smaller, gametes for fertilization
produces fewer, but larger, gametes for fertilization
female
male
expends more energy in reproduction and greater effort in raising offspring
expends less energy, but competes with others for access to the higher-investing sex
female
male
tends to question whether the progeny are its own
is more certain that the progeny are its own
female
male
has a greater total reproductive output
has greater reproductive investment
female
male
CORRECT.
explanation
Kangaroos are polygynous: a dominant male will mate and produce offspring with several females. Fertilization takes place in the female. When a female gives birth, her single offspring emerges, hairless and blind. It immediately crawls into her abdominal pouch, where it stays for six months of nurturing and further development.
The female is not likely to know whether the offspring is actually hers.
The female makes the greater reproductive investment.
In her lifetime, the female is likely to produce more offspring than her mate.
Compared to males, females tend to be more selective about their mates.
Males are likely to compete with each other for a mate.
Females are likely to perform a courtship ritual to gain the interest of males.
Ospreys (also called fish hawks) are monogamous birds. Prior to mating season, a male will build a nest and present it to potential mates. After the female lays eggs in her mate’s nest, both sexes take turns incubating them. After the eggs hatch, the male is primarily in charge of catching fish and feeding the young until they are big enough to leave the nest.
The male will have the higher reproductive output.
Both sexes make an equal reproductive investment.
Male body size will be larger than the female.
Neither sex will be selective about a mate.
Males are likely to compete with each other for a mate.
Males will have flashy coloration to attract a female.