BIO 370 Exam 2 Question and answers
verified to pass 2025/2026
True/False: The majority of organisms are sexual. - correct answer ✔True
True/False: Asexual lineages have a sporadic taxonomic distribution and are evolutionarily short-lived,
compared to sexual lineages. - correct answer ✔True
True/False: Cyclic asexuality suggests that asexuality can be advantageous during specific times. - correct
answer ✔True
True/False: There are many known ancient asexual clades. - correct answer ✔False
What does sex do? - correct answer ✔Gene exchange and recombination through zygote formation
True/False: Genetic mechanisms associated with sexual reproduction decrease genetic variation among
gametes & offspring. - correct answer ✔False
Recombination - correct answer ✔Crossing-over between/independent assortment of chromosomes
during meiosis
Consequence of crossing-over and independent assortment - correct answer ✔Increased genetic
variation between gametes & offspring
Disadvantages (costs) of sex - correct answer ✔a. Cost of meiosis = cost of mates
b. Need to find sexual partner
c. Sexually transmitted diseases
, d. For females: mixing own genes with mutated male genes
e. Breaking up co-adapted gene complexes
Advantages (benefits) of sex - correct answer ✔a. Faster elimination of deleterious mutations
b. Faster evolution (bringing mutations together)
True/False: 50% chance of elimination = an allele coding for sexuality has 50% fitness compared to
asexuality allele - correct answer ✔True
2 aspects of the cost of meiosis - correct answer ✔a. Cost of 50% elimination of allele coding for
sexuality
b. Cost of producing males
Gene view - correct answer ✔Cost of 50% elimination of any gene coding for sexuality
Individual (mother's) view - correct answer ✔Investing into sons instead of asexual daughters
2 principal ways go making gametes - correct answer ✔a. Few, large gametes
b. Many, small gametes
Anisogamy - correct answer ✔Definition: Production of small and large gametes coexist in same
population
Significance: Basis for sex determination and initial inequality
Sexes are tradeoff between: - correct answer ✔a. Reproductive effort
b. Mating effort
verified to pass 2025/2026
True/False: The majority of organisms are sexual. - correct answer ✔True
True/False: Asexual lineages have a sporadic taxonomic distribution and are evolutionarily short-lived,
compared to sexual lineages. - correct answer ✔True
True/False: Cyclic asexuality suggests that asexuality can be advantageous during specific times. - correct
answer ✔True
True/False: There are many known ancient asexual clades. - correct answer ✔False
What does sex do? - correct answer ✔Gene exchange and recombination through zygote formation
True/False: Genetic mechanisms associated with sexual reproduction decrease genetic variation among
gametes & offspring. - correct answer ✔False
Recombination - correct answer ✔Crossing-over between/independent assortment of chromosomes
during meiosis
Consequence of crossing-over and independent assortment - correct answer ✔Increased genetic
variation between gametes & offspring
Disadvantages (costs) of sex - correct answer ✔a. Cost of meiosis = cost of mates
b. Need to find sexual partner
c. Sexually transmitted diseases
, d. For females: mixing own genes with mutated male genes
e. Breaking up co-adapted gene complexes
Advantages (benefits) of sex - correct answer ✔a. Faster elimination of deleterious mutations
b. Faster evolution (bringing mutations together)
True/False: 50% chance of elimination = an allele coding for sexuality has 50% fitness compared to
asexuality allele - correct answer ✔True
2 aspects of the cost of meiosis - correct answer ✔a. Cost of 50% elimination of allele coding for
sexuality
b. Cost of producing males
Gene view - correct answer ✔Cost of 50% elimination of any gene coding for sexuality
Individual (mother's) view - correct answer ✔Investing into sons instead of asexual daughters
2 principal ways go making gametes - correct answer ✔a. Few, large gametes
b. Many, small gametes
Anisogamy - correct answer ✔Definition: Production of small and large gametes coexist in same
population
Significance: Basis for sex determination and initial inequality
Sexes are tradeoff between: - correct answer ✔a. Reproductive effort
b. Mating effort
