AnswersBiology 1-2 Lab Based AIntroduction to Genetics

Introduction to Genetics — Unit test Answers

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1
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How are the alleles for sex-linked traits inherited?

A
They are passed from the Y chromosome in parents to the X chromosome in offspring.
B
They are passed from the X chromosome in parents to the XY chromosome in offspring.
C
They are passed from parents to offspring on the X and Y chromosomes.
D
They are passed from any chromosome in the parents to the X or Y chromosome in the offspring.
2
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What is genotype for a recessive trait found on the female chromosome?

A
Yh
B
Xh
C
XH
D
YH
3

Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree. Based on the pedigree, if Charles and Marie have a daughter in the future, what is the probability that she will have hemophilia?

Question illustration
A
0 percent
B
25 percent
C
50 percent
D
100 percent
4

Which pedigree symbol is used to represent a female carrier of a recessive X-linked trait?

A
An empty circle.
Option A
B
A half-filled circle.
Option B
C
An empty square.
Option C
D
A filled square.
Option D
5

Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows a cross in which the probability of offspring will have red eyes is 100 percent?

A
A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x Upper R. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X r, Upper X Upper R Y, X Upper R Upper Y, X Upper R Upper X r.
Option A
B
A Punnett square is shown. The columns are labeled Upper X Upper R and Upper Y. The rows are labeled x Upper R and x r. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X Upper R, Upper X Upper R Upper Y, Upper X r Upper Y, Upper X uppercase Upper R Upper X r.
Option B
C
A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x r and x r. Clockwise, from top-left, the boxes include: Upper X r Upper X r, Upper X r Upper Y, Upper X r Upper Y, Upper X r Upper X r.
Option C
D
A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x r. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X r, Upper X Upper R Y, Upper X r Upper Y, Upper X r Upper X r.
Option D
6

Mendel was able to study seven traits in all the pea plants in each generation. Which of his hypotheses allowed him to analyze each trait separately?

A
If two different alleles for a gene occur together, one of the alleles may be expressed while the other is hidden.
B
When gametes are formed, each gamete carries only one allele for the gene.
C
There are alternate versions of a alleles called genes.
D
For each inherited trait, there is only one copy of the gene that codes for that trait.
7

If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?

A
F1 generation only
B
P generation only
C
F1 generation and F2 generation
D
P generation and F2 generation
8

Which represents the cross between parent plants if one is heterozygous and has yellow-colored pods and the other is homozygous and has green-colored pods?

A
Yy ´ yy
B
YY ´ yy
C
Yy ´ Yy
D
yy ´ yy
9

The pedigree traces red-green color blindness. Which family members have red-green color blindness?

Question illustration
A
Sam, Tim, Bella, and Joshua
B
Lisa and Monica
C
Ben, Jenny, Mike, Carol, Katie, and Chris
D
Sam, Joshua, and Tim
10

The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

A
A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, Upper D d, Upper D d, Upper D d.
Option A
B
A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, d d, d d, Upper D d.
Option B
C
A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled Upper D and d. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D d, d d, UpperD d.
Option C
D
A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled Upper D and Upper D. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D Upper D, Upper D Upper D, Upper D Upper D.
Option D
11

Which are different forms of the same gene?

A
genotypes
B
phenotypes
C
alleles
D
traits
12

Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree. Who has hemophilia in the pedigree that is shown?

Question illustration
A
John and Ann
B
Fred and Luke
C
John, Charles, Jack, and Irene
D
Ann and Marie
13

Which scenario breaks the law of segregation?

A
a gamete contains the father’s allele
B
the gametes produced each have 1 allele after meiosis II
C
a gamete produced has 2 of the same alleles after meiosis II
D
the gamete fertilized has the dominant trait

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