AnswersFL-2000310-Biology 1 Sem 1 - FlexApplications of DNA Technology

Applications of DNA Technology — Unit test Answers

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Pedigrees help geneticists understand how traits are inherited between generations. Red-green color blindness is a sex-linked disorder that is determined by a recessive allele on the X chromosome.If Brian has a son who is color-blind, what is known about the genotype of the son's mother?

Question illustration
A
She must have at least one allele for color blindness.
B
She must have two alleles for color blindness.
C
She cannot be homozygous recessive for the gene for color blindness.
D
She cannot be a heterozygous carrier of the gene for color blindness.
2
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Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. Which Punnett square represents the correct way to set up the cross RRYy ´ RrYY?

A
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R y, r Upper Y, r y. The rows are labeled Upper R Upper Y, Upper R y, r Upper y, r y.
Option A
B
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R y, r Upper Y, r y. The rows are labeled Upper R Upper Y, Upper R y, Upper R Upper y, Upper R y.
Option B
C
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R Upper Y, r Upper Y, r Upper Y. The rows are labeled Upper R Upper Y, Upper R y, Upper R Upper Y, Upper R y.
Option C
D
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R Upper Y, r Upper Y, r Upper Y. The rows are labeled Upper R Upper Y, Upper R Upper Y, Upper R Upper Y, Upper R Upper y.
Option D
3

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
4

Corn can be injected with herbicide-tolerant recombinant DNA. Which type of organism is herbicide-tolerant corn?

A
infertile organism
B
purebred organism
C
transgenic organism
D
recombinant organism
5

Red-green color blindness is an X-linked recessive disorder. What is the probability of the offspring having red-green color blindness for the cross that is represented by the Punnett square?

Question illustration
A
0 percent
B
25 percent
C
50 percent
D
75 percent
6

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
7

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
8

In roses, red flowers and long stems are dominant traits. A rose plant that is homozygous for both red flowers and long stems is crossed with a rose plant that is heterozygous for red flowers and homozygous for short stems. What percentage of the offspring will exhibit red, long-stemmed flowers?

A
25 percent
B
50 percent
C
75 percent
D
100 percent
9

Which career combines DNA technology and medicine?

A
nutriceuticals
B
paternity testing
C
environmental studies
D
genetics
10

Which blood type could be given as a transfusion for patient with AB blood when the RH factor is unknown?

A
O+
B
A+
C
AB+
D
AB–
11

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
12

A plant that has round and yellow seeds (RrYy) is crossed with a plant that has round and yellow seeds (RrYy). What is the ratio of the offspring that will have round and yellow seeds?Key: R = round r = wrinkled Y = yellow y = green

A
1:16
B
3:16
C
8:16
D
9:16
13

Parents with the genotypes AO and AB have a child. What are all the possible blood types of the child?

A
A, B
B
O, AB
C
A, AB, B
D
O, AB, A
14

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.
15

The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.What is the phenotypic ratio of the offspring?

Question illustration
A
1:1:1:1:2:2:2:2:4
B
1:3:3:9
C
1:4
D
4:12

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