Week 8 Test Answers

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21
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What does the notation Rr mean to geneticists?

A
heterozygous alleles
B
homozygous alleles
C
dominant alleles
D
recessive alleles
22
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Which statement best describes an understanding of genetics that would be missing without the work of Mendel?

A
The DNA codes for traits would not be known.
B
The protein codes for traits would not be known.
C
Some alleles are dominant, and some alleles are recessive.
D
Offspring receive two copies of each allele from each parent.
23

If you inherit the genotype AO for blood from your parents, what blood type do you have?

A
A
B
B
C
AB
D
O
24

Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Turner syndrome occurs when a female has an incomplete set of sex chromosomes. Symptoms of Turner syndrome include swollen hands and feet, short stature, and infertility. Which type of chromosomal mutation is responsible for causing Turner syndrome?

A
polyploidy
B
tetraploidy
C
aneuploidy
D
trisomy
25

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

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Week 8 Test Answers — Biology_A_IC