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Sex-Linked Traits And Pedigrees
Test Description: Genetics
Instructions: Answer all questions to get your test result.
1) Which combination of sex chromosomes results in a male?
A
XY
B
YY
C
either XX or YY
D
XX
2) Sex linked genes are on
A
all chromosomes
B
X chromosome only
C
X and Y chromosomes
D
Y chromosome only
3) Hemophilia is caused by
A
recessive allele on the Y chromosome
B
recessive allele on the X chromosome
C
dominant allele
D
extra chromosome
4) Which genetic disorder results in abnormally shaped blood cells
A
Sickle-Cell Anemia
B
Hemophilia
C
Down Syndrome
D
Cystic Fibrosis
5) A carrier is a person who has
A
2 recessive alleles for a trait
B
2 dominant alleles for a trait
C
one recessive and one dominate allele for a trait
D
more than 2 alleles for a trait
6) Factors that control traits are
A
recessive
B
homozygous
C
purebred
D
genes
7) Why do sex-linked traits appear more often in males than in females
A
A recessive allele on the X chromosome will always produce the trait in a male
B
All alleles on the X chromosome are dominant
C
Any allele on the Y chromosome will be codominant with the matching allele on the X chromosome
D
All alleles on the Y chromosome are recessive
8) Why do geneticists use pedigrees?
A
to made genetic crosses
B
to prove that sex linked traits are caused by codominant alleles
C
to replicate strings of DNA
D
to trace inheritance of specific traits in a family
9) On a pedigree chart, a half shaded circle indicates what?
A
male carrier
B
female carrier
C
normal female
D
female with a disease
10) On a pedigree chart, a white square indicates what.
A
male with a disease
B
normal female
C
male carrier
D
normal male
*select an answer for all questions
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