Download Meiosis and Genetics Test Review Spring 2016

Name _______________________________Date _________________ Period _____
Meiosis and Genetics Test Review
I. TEKS
6E: Identify and illustrate changes in DNA and evaluate the significance of these changes.
6F: Predict possible outcomes of various genetic combinations such as monohybrid and dihybrid
crosses and non-Mendelian inheritance.
6G: Recognize the significance of meiosis to sexual reproduction.
6H: Describe how techniques such as DNA fingerprinting, genetic modifications and chromosomal
Analysis are used to study the genomes of organisms.
II. Questions and Problems
In guinea pigs, long hair is dominant over short hair.
1. A long fur guinea pig is heterozygous. Its mate is also heterozygous for long fur.
a. Genotypic ratio:
b. Phenotypic ratio:
2. Referring to the dihybrid cross above, answer the questions below.
a. How many of the seeds will be purebred for both traits?
b. If round and yellow are dominant traits, how many seeds will express this phenotype?
c. What are the genotypes of the parents from this cross?
3. What are the sex chromosomes for normal male?
4. What are the sex chromosomes for a normal female?
5. Why do sex-linked traits occur more frequently in males than in females?
6. Review the following genetic disorders and know the inheritance for each and how it affects a
person who may have the disorder. The first disorder is done as an example for you.
a. Down syndrome- p313; non-disjunction chromosomal disorder; extra chromosome on pair 21,
also called Trisomy 21; mild to severe mental retardation and distinct facial features.
b. Cystic fibrosis p297
c. Colorblindness p307
d. Hemophilia p308
e. Sickle cell disease p303
Use the pedigree to answer the questions:
8.
9.
10.
11.
7.
Event
12.
Produces 4 cells
Produces 2 cells
New cells identical to parent cell
New cells different than parent cell
New cells have same number of chromosomes as
parent cell
New cells have fewer number of chromosomes than
parent cell
Beginning cells diploid (2n)
Beginning cells haploid (n)
Ending cells diploid (2n)
Ending cells haploid (n)
Produces egg and sperm (germ cells/sex cells)
Produces body cells (somatic cells)
Mitosis
Meiosis
13. In Drosophila (fruit flies) the sex-linked trait of red eye color (XR) is dominant over white (Xr). Which
is the correct genotype for a red-eyed male fruit fly?
a. XRXr
c. XrY
r
b. X X
d. XRY
14. Rebecca went to a genetic counselor. When she had testing done she found that she was a carrier for
the disease Tay Sachs. She was normal and showed no signs of the disorder but she could pass the trait on
to her offspring. Which of the following would correctly represent Rebecca’s genotype?
a. NN
c. nn
b. Nn
d. Nt
15. If a woman with the type O blood and a man with the type AB blood have children, are they
likely to have a child with Type O blood? (A dominant, B Dominant, O recessive) 6F
Blood Type
A
B
AB
O
Answer the questions using the diagram below:
16.
17. How many autosomes are present?
18. What is the gender of this individual?
19. Can you detect any chromosomal disorders?
20. What is the diagram above called?
Genotype
IAIA or IAi
IBIB or IBi
I AI B
ii