BIOL 3001 MIDTERM EXAM 2025
QUESTIONS AND ANSWERS
What are the learning objectives for Lab 1? - ANS - Understand the basic attributes of
Drosophila melanogaster
- Conduct crosses and collect progeny data using the fly portal
- Design and diagram monohybrid crosses
- Complete chi-squared analyses to compare observed versus expected traits
- Better understand the effects of different progeny number (sample size) on expected ratios
modes of inheritance - ANS manner in which a genetic trait or disorder is passed from one
generation to the next
What family, order, and class is Drosophila melanogaster classified in? - ANS Family:
Drosophilidae
Order: Diptera (which also includes flies, mosquitoes and midges)
Class: Insecta (insects)
What does Drosophila (genus name) mean? - ANS dew-lover
What does melanogaster mean? - ANS black abdomen
1|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
, What other names do fruit flies have? - ANS red-eyed pomace fly, vinegar fly and wine fly, all
relating to this species' attraction to fermenting fruits
How did fruit flies get their name? - ANS because they are collected by placing a bottle
containing over-ripe fruit (often bananas) outside
wild-type - ANS phenotype most commonly captured in the wild
How many chromosomes do fruit flies have? - ANS 4 pairs (2n=8)
What chromosome in fruit flies determines sex? - ANS chromosome I
lygaues mode - ANS presence of different sex chromosomes
T or F: Sex-determination in fruit flies follows the lygaeus mode. - ANS true
T or F: In fruit flies, females are XX and males are XY. - ANS true
T or F: Sex is dependent on the actual number of X chromosomes in fruit flies. - ANS true
How can the genders be distinguished in fruit flies? - ANS - Females are larger than males.
- Females have a "knob" (ovipositor) on the tip of the abdomen.
- Males have a solid abdomen while females have stripes.
standard F1 cross - ANS crosses offspring from the F1 Generation to each other
2|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
QUESTIONS AND ANSWERS
What are the learning objectives for Lab 1? - ANS - Understand the basic attributes of
Drosophila melanogaster
- Conduct crosses and collect progeny data using the fly portal
- Design and diagram monohybrid crosses
- Complete chi-squared analyses to compare observed versus expected traits
- Better understand the effects of different progeny number (sample size) on expected ratios
modes of inheritance - ANS manner in which a genetic trait or disorder is passed from one
generation to the next
What family, order, and class is Drosophila melanogaster classified in? - ANS Family:
Drosophilidae
Order: Diptera (which also includes flies, mosquitoes and midges)
Class: Insecta (insects)
What does Drosophila (genus name) mean? - ANS dew-lover
What does melanogaster mean? - ANS black abdomen
1|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
, What other names do fruit flies have? - ANS red-eyed pomace fly, vinegar fly and wine fly, all
relating to this species' attraction to fermenting fruits
How did fruit flies get their name? - ANS because they are collected by placing a bottle
containing over-ripe fruit (often bananas) outside
wild-type - ANS phenotype most commonly captured in the wild
How many chromosomes do fruit flies have? - ANS 4 pairs (2n=8)
What chromosome in fruit flies determines sex? - ANS chromosome I
lygaues mode - ANS presence of different sex chromosomes
T or F: Sex-determination in fruit flies follows the lygaeus mode. - ANS true
T or F: In fruit flies, females are XX and males are XY. - ANS true
T or F: Sex is dependent on the actual number of X chromosomes in fruit flies. - ANS true
How can the genders be distinguished in fruit flies? - ANS - Females are larger than males.
- Females have a "knob" (ovipositor) on the tip of the abdomen.
- Males have a solid abdomen while females have stripes.
standard F1 cross - ANS crosses offspring from the F1 Generation to each other
2|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
