Download Genetics Test Study Guide How many chromosomes are shown in a

Genetics Test Study Guide
1.
2.
3.
4.
5.
How many chromosomes are shown in a normal human karyotype?
The purpose of gene therapy is to
Which human genetic disorder is caused by a dominant allele that expresses itself late in a person’s life?
A pedigree can be used to
How many different allele combinations would be found in the gametes produced by a pea plant whose genotype was
RrYY?
6. The process of DNA fingerprinting is based on the fact that
7. Because the X chromosome contains genes that are vital for normal development, no baby has been born
8. A female guinea pig homozygous dominant for black fur color is mated with a male homozygous for white fur color. In a
litter of eight offspring, there would probably be _____.
9. Most sex-linked genes are located on
10. Examine the graph which illustrates the frequency in types of skin pigmentation in humans. Another human trait that would
show a similar inheritance pattern and frequency of distribution is _____.
11. A heterozygous tall pea plant is crossed with a short plant. The probability that an F1 plant will be tall is
12. In pea plants, inflated pods (R) are dominant to constricted pods (r). Which of the following crosses is a test cross?
13. If a female fruit fly heterozygous for red eyes (X RXr) crossed with a white-eyed male (XrY), what percent of their offspring
would have white eyes?
14. A couple has two children, both of whom are boys. What is the chance that the parents' next child will be a boy?
15. In chickens, rose comb (R) is dominant to single comb (r). A homozygous rose-combed rooster is mated with a singlecombed hen. All of the chicks in the F1 generation were kept together as a group for several years. They were allowed to
mate only within their own group. What is the expected phenotype of the F2 chicks?
16. A dog's phenotype can be determined by _____.
17. Because the gene for red-green color blindness is located on the X chromosome, it is normally not possible for a _____.
18. What percentage of human sperm cells carry an X chromosome?
19. If you made a Punnett square showing Gregor Mendel’s cross between true-breeding tall plants and true-breeding short
plants, the square would show that the offspring had
20. In a pedigree, a circle represents a(an)
21. A man heterozygous for blood type A marries a woman heterozygous for blood type B. The chance that their first child will
have type O blood is _____.
22. A tall plant is crossed with a short plant. If the tall F1 pea plants are allowed to self-pollinate, what will be offspring like?
23. When you flip a coin, what is the probability that it will come up tails?
24. Organisms that have two identical alleles for a particular trait are said to be
25. The Human Genome Project is an attempt to
26. People who are heterozygous for sickle cell disease are generally healthy because
27. Human females produce egg cells that have ______ chromosome(s).
28. When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited
29. A cross between a white rooster and a black hen results in 100% blue Andalusian offspring. When two of these blue
offspring are mated, the probable phenotypic ratio seen in their offspring would be _____.
RY
Ry
rY
ry
RY
RRYY
RRYy
RrYY
RrYy
Ry
RRYy
RRyy
RrYy
Rryy
RrYy
rY
RrYY
RrYy
rrYY
rrYy
ry
RrYy
Rryy
rrYy
rryy
Seed Shape
R = Round
r = Wrinkled
Seed Color
Y = Yellow
y = Green
Figure 11–2
30. The Punnett square in Figure 11–2 shows that the gene for pea shape and the gene for pea color
31. In mink, brown fur color is dominant to silver-blue fur color. If a homozygous brown mink is mated with a silver-blue mink
and 8 offspring are produced, how many would be expected to be silver-blue?
32. Which of the following combinations of sex chromosomes represents a female?
33. When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because
34. When roan cattle are mated, 25% of the offspring are red, 50% are roan, and 25% are white. Upon examination, it can be
seen that the coat of a roan cow consists of both red and white hairs. This trait is one controlled by _____.
35. If a man with blood type A and a woman with blood type B produce an offspring, what might be the offspring’s blood type?
T
t
T
TT
Tt
T
TT
Tt
TT
T
=
Tall
t
=
Short
Figure 11–1
36. In the Punnett square shown in Figure 11–1, which of the following is true about the offspring resulting from the cross?
37. Gregor Mendel used pea plants to study
38. A male and female bison that are both heterozygous for normal skin pigmentation (Aa) produce an albino offspring (aa).
Which of Mendel’s principles explain(s) why the offspring is albino?
39. Which of the following genotypes result in the same phenotype (blood type)?
40. A cross of a black chicken (BB) with a white chicken (WW) produces all speckled offspring (BW). This type of inheritance is
known as