You are a genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she
could have hemophilia. Neither of them has hemophilia, but the woman's biological father did have an X-linked recessive
form of hemophilia. How should you advise them?
a. Half of their children will have hemophilia.
b. All of their sons and half of their daughters will have hemophilia.
c. None of their children will have hemophilia, but all of their daughters will be carriers for hemophilia.
d. Each of their sons will have a 50% chance of having hemophilia, and each of their daughters will have a 50%
chance of being carriers.
e. All of their sons will have hemophilia, and all of their daughters will be carriers.
ANSWER: d
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What will be an ideal response?
When a ciliate reproduces asexually by mitosis
A. The macronucleus divides into two with each new cell receiving an identical macronucleus. B. The macronucleus divides into four micronuclei with each new cell receiving two micronuclei each. C. The macronucleus doesn't divide but it goes to one new cell and the micronuclei go to the other. D. The macronuclei fuse with the micronuclei and then divide into two with each new cell receiving an identical fused nucleus.
According to Mendel, what kinds of genes
“disappear” in F1 pea plants? a. sex-linked b. dominant c. recessive d. codominant e. lethal
What is different between two alleles of the same gene?
A) Their location. For example, one allele might be at the end of one chromosome, while the other allele is in the middle of another chromosome. B) The chromosome number they are on. For example, one allele might be on chromosome 12, while the other one is on chromosome 3. C) The information they carry. For example, one allele might carry the information for blue eye pigment, while the other carries the information for brown eye pigment. D) The cell they are in. For example, one might be in a liver cell, while the other is in a blood cell.