AnswersBiology 2 SS26 CR – 070-571200R-T1-PM-EDG-3Unit Test

Unit Test — Unit test Answers

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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–
2
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Which are different forms of the same gene?

A
genotypes
B
phenotypes
C
alleles
D
traits
3

Which is an application of DNA technology in medicine?

A
mapping human genes for manipulation
B
determining specific traits that a baby will have before its conception
C
producing disease resistant humans
D
determining hereditary diseases in individuals and families
4

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
5

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
6

Some flowering plants appear to have offspring that have traits that are intermediate between those of the parents. Which type of dominance is exhibited by the offspring?

A
complete dominance
B
blended dominance
C
codominance
D
incomplete dominance
7

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
8

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
9

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
10

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
11

Which career combines DNA technology and medicine?

A
nutriceuticals
B
paternity testing
C
environmental studies
D
genetics
12

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.
13

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
14

A cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. What proportion of the offspring from the second cross will be purple?

A
1 in 4
B
2 in 4
C
3 in 4
D
4 in 4
15

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

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