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Heredity
Test Description: Chapter 4 and 5
Instructions: Answer all questions to get your test result.
1) Scientists call an organism that has 2 different alleles for a trait a __________.
A
purebred
B
trait
C
hybrid
D
factor
2) What does the notation TT mean to a geneticist?
A
heterozygous alleles
B
2 recessive alleles
C
2 dominant alleles
D
one dominant and one recessive allele
3) What happens during meiosis?
A
two sex cells combine
B
each sex cell copies itself to form 4 new chromosomes
C
chromosome pairs remain together when new sex cells are formed
D
Chromosome pairs separate and are distributed into new cells
4) What does mRNA do during protein synthesis?
A
copied the coded message from the DNA and carries it into the nucleus
B
copies the coded message from one protein & carries it to the nucleus
C
carries the amino acids & adds them to the growing protein
D
copied the coded message from the DNA and carries it into the cytoplasm
5) What genetic discorder results in abnormally shaped blood cells?
A
cystic fibrosis
B
Down syndrome
C
hemophilia
D
sickle-cell anemia
6) What is probability?
A
the number of times a coin lands heads up
B
the way the results of one event affect the next event
C
the number that describes how likely it is that an event will occur
D
the actual results from a series of events
7) In Mendel's experiments, what proportion of the plants in the F2 generation had a trait that had been absent in the F1 generation?
A
three fourths
B
one fourth
C
half
D
none
8) Factors that control a trait are called ___________.
A
recessives
B
genes
C
purebreds
D
parents
9) When sex cells combine to produce offspring, each sex cell will contribute ______.
A
the normal number of chromosomes in body cells
B
one fourth the number of chromosomes in body cells
C
half the number of chromosomes in body cells
D
twice the number of chromosomes in body cells
10) What is a karyotype?
A
a picture of the chromosomes in a cell
B
a sex-linked gene disorder
C
fluid that surrounds a baby before it is born
D
a picture of a baby before it is born
*select an answer for all questions
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