A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X- linked recessive. What proportion of their sons would be color-blind and of normal height?
1. | All | 2. | None |
3. | Half | 4. | One out of four |
Male pattern baldness is a ___________ trait.
1. | Sex-linked | 2. | Sex-limited |
3. | Sex-influenced | 4. | Y-linked |
Which of a women's grandparents could not be the source of any of the genes on either of her X-chromosomes?
1. | Mother's Father. | 2. | Father's Mother. |
3. | Mother's Mother. | 4. | Father's Father. |