Download Insect Genetics

Genetics Unit Review
Any question that is not “fill in the blank” you need to write a complete sentence
answer on another sheet of paper (on the back of the packet is fine).
1. What is your plan for studying? Which nights, what times, for how long, which
lesson, how will you study?
2. What is heredity?
3. Explain the role of chromosomes in heredity.
4. What scientist made important discoveries that allow us to study
genetics?_____________
5. What organism did the scientist in question 4 study?____________________
6. What are the differences between sexual and asexual reproduction?
7. Where does mitosis occur?_________________
8. Mitosis results in _____ cells.
9. Where does meiosis occur?________________or _________________
10. What is the purpose of meiosis?______________________________________
11. Meiosis results in _____ cells.
12. An elephant normally has 56 chromosomes in its cells.
a. How many pairs of chromosomes does an elephant have in its cells?______
b. After mitosis occurs, how many pairs of chromosomes would be in each of
the elephant’s body cells?______
c. After meiosis occurs, how many chromosomes would be in each of the
elephant’s sex cells.
13. Which determines the other—genotype or phenotype?______________
14. If you are heterozygous for having a Widow’s Peak, what is your genotype?______
15. A gene that controls a recessive gene is said to be______________.
16. Explain why a plant with the genotype Tt is tall instead of medium sized.
17. If yellow seed (Y) is dominant over green seed (y) in pea plants, what is (are) the
possible genotypes of a pea plant with yellow seeds? _________________
18. Why is it important to study genetics?
19. The ability to roll your tongue is dominant (R) while the inability to roll your tongue is
recessive. Make a Punnett square showing the possible offspring from an Rr male
and an rr female. Then answer a & b.
a. What are the chances of these parents having an offspring with the ability to
roll their tongue? ______ %
b. If an offspring is unable to roll their tongue, would the genotype be rr?
______
Name:
Period:
Insect Genetics
Traits and Symbols:
Body Part
Dominant
Allele
Body
Spotted
Legs
Striped
Eyes
Green
Antenna
Long
Wings
Waxed
Symbol
B
L
E
A
W
Recessive
Allele
Plain
Clear
White
Short
Foil
Symbol
b
l
e
a
w
Practice Identifying Genotypes—Remember every individual has two genes for each trait (one
from their mom and from their dad). Figure out what two genes each insect below would have.
Description
Genes
Homozygous (purebred) spotted body
_____ _____
Heterozygous (hybrid) legs
_____ _____
White eyes
_____ _____
Foil wings
_____ _____
Heterozygous (hybrid) antenna
_____ _____
Homozygous (purebred) waxed wings
_____ _____
Plain body
_____ _____
Homozygous (purebred) green eyes
_____ _____
Producing the Offspring Procedure:
• Identify the genotypes of parent bugs.
• Figure out what information the sperm and egg will carry
• "Cross" a male and a female
• Figure out the possible genotypes and phenotypes of the offspring
1.
You carry out a cross between the following two insects:
Male purebred waxed wings x Female foil wings
1
2 Possible Genotypes and %
________
________
3
4
________
Possible Phenotypes and %
________
________
2.
Long or short antenna: You carry out a cross between the following two insects:
Male heterozygous antenna x Female heterozygous antenna
1
2 Possible Genotypes and %
________
________
3
4
________
Possible Phenotypes and %
________
________
3.
Green or white eyes: You carry out a cross between the following two insects:
Male heterozygous eyes
x Female white eyes
1
2 Possible Genotypes and %
________
________
3
4
________
Possible Phenotypes and %
________
________
4.
Striped or clear legs: You carry out a cross between the following two insects:
Male clear
x Female purebred striped
1
2 Possible Genotypes and %
________
________
3
4
________
Possible Phenotypes and %
________
________