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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
hybrid
B
trait
C
factor
D
purebred
2) What does the notation TT mean to a geneticist?
A
2 dominant alleles
B
one dominant and one recessive allele
C
heterozygous alleles
D
2 recessive alleles
3) What happens during meiosis?
A
two sex cells combine
B
chromosome pairs remain together when new sex cells are formed
C
Chromosome pairs separate and are distributed into new cells
D
each sex cell copies itself to form 4 new chromosomes
4) What does mRNA do during protein synthesis?
A
copied the coded message from the DNA and carries it into the cytoplasm
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 nucleus
5) What genetic discorder results in abnormally shaped blood cells?
A
sickle-cell anemia
B
Down syndrome
C
hemophilia
D
cystic fibrosis
6) What is probability?
A
the number that describes how likely it is that an event will occur
B
the way the results of one event affect the next event
C
the number of times a coin lands heads up
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
none
B
half
C
one fourth
D
three fourths
8) Factors that control a trait are called ___________.
A
purebreds
B
genes
C
parents
D
recessives
9) When sex cells combine to produce offspring, each sex cell will contribute ______.
A
half the number of chromosomes in body cells
B
the normal number of chromosomes in body cells
C
twice the number of chromosomes in body cells
D
one fourth the number of chromosomes in body cells
10) What is a karyotype?
A
fluid that surrounds a baby before it is born
B
a picture of the chromosomes in a cell
C
a picture of a baby before it is born
D
a sex-linked gene disorder
*select an answer for all questions
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