Genetic traits

QUESTION 1

1. In Mendel’s time, most people believed that all genetic traits bred true. inheritance was controlled by blood. the charactertistics of parents were blended in offspring. aquired characteristics were inherited.
   1 points
   QUESTION 2
2. Which of the following indicate homozygous genotypes? aa Aa AA
   1 points
   QUESTION 3
3. Which of the following genotypes show dominant pheotypes? aa Aa AA
   1 points
   QUESTION 4
4. If tall (D) is dominant to dwarf (d), and two homozygous varieties DD and dd are crossed, then what kind of offspring will br produced? all Dd all DD all dd 1/2 Dd, 1/2 dd
   1 points
   QUESTION 5
5. If short hair (L) is dominant to long hair (l), then what fraction of the offspring produced by a cross of Ll x ll will have long hair? 1/4 1/3 1/2 no chance
   1 points
   QUESTION 6
6. A man with AB blood marries a woman with O blood. What are the possible blood types their children could have, and at what ratios?

Path: p
Words:0

2 points
QUESTION 7

1. What is the difference between codominance and incomplete dominance?

Path: p
Words:0

2 points
QUESTION 8

1. How is eye color determined in humans?

Path: p
Words:0

2 points
QUESTION 9

1. Explain how two people that have achondroplasia (a form of dwarfism) can have a normal sized child.

Path: p
Words:0

3 points
QUESTION 10

1. Why are human males more likely to show rare phenotypes controlled by recessive alleles on the X chromosome?

Path: p
Words:0

3 points
QUESTION 11

1. If a daughter expresses an X-linked recessive gene, she inherited the trait from
   her mother
   her father
   both parents
   neither parent
   1 points
   QUESTION 12
2. An X-linked carrier is a
   homozygous dominant female
   heterozygous female
   homozygous recessive female
   heterzygous male
   1 points
   QUESTION 13
3. Red-green colorblindness in an x-linked recessive trait in humans. A colorblind man and a woman with normal vision whose father was colorblind have a duaghter. The probability that their daughter is colorblind is
   0%
   25%
   50%
   100%
   1 points
   QUESTION 14
4. Red-green colorblindness in an x-linked recessive trait in humans. A colorblind woman and a man with normal vision have a son. The probability that their son is colorblind is
   0%
   25%
   50%
   100%
   1 points
   QUESTION 15
5. Red-green colorblindness in an x-linked recessive trait in humans. A colorblind man and a woman with normal vision whose father was colorblind have a child. The probability that their child is a carrier is
   0%
   25%
   50%
   100%
   1 points
   QUESTION 16
6. A person with Down’s syndrome has a trisomy of which chromosome?
   1
   21
   23
   X
   1 points
   QUESTION 17
7. Why are extra X chromosomes in females not considered a problem?

Path: p
Words:0

2 points
QUESTION 18

1. Match the following sex chromosome genotype to the correct name.

XO

XX

XY

XXY
A. Normal Male
B. Kleinfelter’s Syndrome
C. Turner’s Syndrome
D. Normal Female

4 points
QUESTION 19

1. A chromosome’s gene sequence that was ABCDEFG before damage and ABCFG after is an example of inversion duplication deletion translocation