1. The type of inheritance shown when a red-flowering plant is crossed with a white-flowering plant and only

Question

1. The type of inheritance shown when a red-flowering plant is crossed with a white-flowering plant and only pink-flowering plants are produced is _____.

(1 point)

inbreeding

incomplete dominance

polygenic inheritance

codominance

2. Eye color in humans is the result of _____ inheritance.

(1 point)

multiple allelic

polygenic

s*x-linked

simple dominant

3. Which of the following situations is most usual for a dominant allele that results in severe effects in the offspring?

(1 point)

Both parents have the trait.

Only a single offspring has the trait.

The trait occurs by mutation.

none of these

4. Which of the following genetic disorders can be detected by karyotyping?

(1 point)

Down syndrome

Tay-Sachs disease and phenylketonuria

hemophilia and cystic fibrosis

Klinefelter syndrome and sickle-cell anemia

5. 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 _____.

(1 point)

0%

25%

50%

75%

Answer 1

1. codominance (both are expressed)

2. polygenic (several genes come into play)

3. trait occurs by mutation (severe effects from dominant genes would reduce the ability to reproduce)

4. down syndrome (extra chromosome)

5. 25% (.5 * .5)