BLG 144 Midterm 1 Questions And
100% Verified Answers| Latest 2026
Update| Graded A+
mutation - Correct Answer -evolutionary mechanism that increases genetic
diversity by changes in makeup of chromosomes
-slow compared to other mechanisms (gene flow)
deleterious alleles - Correct Answer -lower fitness
beneficial allele - Correct Answer -allows individuals to produce more offspring
inbreeding - Correct Answer -mating between relatives (share a common
ancestor)
-makes hertozygotes into homozygotes
- does not cause evolution since there are no allele frequency changes (only
changes genotype frequencies)
-CAN SPEED THE RATE OF EVOLUTIONARY CHANGE by elimination deleterious
alleles - purifying selection
,assortative mating - Correct Answer -when mating is nonrandom with respect to
specific traits
difference between negative and positive assortment - Correct Answer -negative-
individuals tend to choose mates that differ in phenotypic traits
positibe- they tend to choose mates that are similar in phenotypic traits
sexual selection - Correct Answer -when individuals within a population differ in
their ability to attract mates
-favours individuals with heritable traits that enhance their ability to obtain mates
-violates hardy-weinberg
bateman- trivers theory - Correct Answer --sexual selection usually acts more
strongly on males than on females, thus traits that attract members of the
opposite sex are much more highly elaborated in males
-"eggs are expensive but sperm are cheap" ---energetic cost
asymmetry of sex - Correct Answer --females are choosy since they invest much
more in their offspring than males and will therefore need resources covered
, how do females choose mates - Correct Answer -based on
1. physical characteristics that signal genetic quality
2. resources or parental care provided by males
3. orboth
why does sexual selection become more intense - Correct Answer --there's male-
male competition for mates
-males tend to have many more traits that function only in courtship
sexual dimorphism - Correct Answer -refers to the any trait that differs between
males and females
what happens if gene flow ends - Correct Answer -allele frequencies in isolated
populates are free to diverge- species begin to evolve independently of each other
speciation - Correct Answer -splitting event that creates two or more distinct
species from a single ancestral group
-results from genetic isolation and genetic divergence
100% Verified Answers| Latest 2026
Update| Graded A+
mutation - Correct Answer -evolutionary mechanism that increases genetic
diversity by changes in makeup of chromosomes
-slow compared to other mechanisms (gene flow)
deleterious alleles - Correct Answer -lower fitness
beneficial allele - Correct Answer -allows individuals to produce more offspring
inbreeding - Correct Answer -mating between relatives (share a common
ancestor)
-makes hertozygotes into homozygotes
- does not cause evolution since there are no allele frequency changes (only
changes genotype frequencies)
-CAN SPEED THE RATE OF EVOLUTIONARY CHANGE by elimination deleterious
alleles - purifying selection
,assortative mating - Correct Answer -when mating is nonrandom with respect to
specific traits
difference between negative and positive assortment - Correct Answer -negative-
individuals tend to choose mates that differ in phenotypic traits
positibe- they tend to choose mates that are similar in phenotypic traits
sexual selection - Correct Answer -when individuals within a population differ in
their ability to attract mates
-favours individuals with heritable traits that enhance their ability to obtain mates
-violates hardy-weinberg
bateman- trivers theory - Correct Answer --sexual selection usually acts more
strongly on males than on females, thus traits that attract members of the
opposite sex are much more highly elaborated in males
-"eggs are expensive but sperm are cheap" ---energetic cost
asymmetry of sex - Correct Answer --females are choosy since they invest much
more in their offspring than males and will therefore need resources covered
, how do females choose mates - Correct Answer -based on
1. physical characteristics that signal genetic quality
2. resources or parental care provided by males
3. orboth
why does sexual selection become more intense - Correct Answer --there's male-
male competition for mates
-males tend to have many more traits that function only in courtship
sexual dimorphism - Correct Answer -refers to the any trait that differs between
males and females
what happens if gene flow ends - Correct Answer -allele frequencies in isolated
populates are free to diverge- species begin to evolve independently of each other
speciation - Correct Answer -splitting event that creates two or more distinct
species from a single ancestral group
-results from genetic isolation and genetic divergence
