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Chromosomes Answers

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3

Pedigrees and karyotypes provide the means for individuals to identify their risks of genetic disorders. What can be observed on a karyotype but not on a pedigree?

A
family carriers of a genetic disorder
B
family history of a genetic disorder
C
risk of a genetic disorder in offspring
D
a visual image of a chromosomal defect
4

Which diagram correctly shows how heterozygous alleles are found on homologous chromosomes?

A
A chromosome is labeled Upper A a.
Option A
B
A chromosome is labeled a a.
Option B
C
2 chromosomes are labeled Upper A and a.
Option C
D
2 chromosomes are labeled a and a.
Option D
5

Which illustration depicts homologous chromosomes?

A
A single chromosome is shown.
Option A
B
2 identical chromosomes are shown.
Option B
C
A single chromosome is shown.
Option C
D
2 identical chromosomes are shown.
Option D
8

Which statement about sister chromatids is true?

A
One sister chromatid is inherited from each parent.
B
Sister chromatids are always in every cell.
C
Sister chromatids are only present during cell reproduction.
D
Each sister chromatid forms a lobe of a chromosome.
9

Anita thinks that she has heterozygous alleles for red hair. If she is correct, which of these diagrams best illustrates Anita’s alleles for red hair?

A
2 chromosomes are labeled Upper R and Upper R.
Option A
B
2 chromosomes are labeled Upper R and r.
Option B
C
One chromosome is labeled Upper R and another is unlabeled.
Option C
D
2 chromosomes are labeled r and r.
Option D
10

In cell biology, what does the word queue describe?

A
the short arm of a chromosome
B
the long arm of a chromosome
C
the center of a chromosome
D
the material of a chromosome

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