| A | B |
|---|
| Which of these traits is controlled by a gene with multiple alleles? | blood type |
| What are multiple alleles? | three or more forms of a gene that code for a single trait |
| Both parents of a child have type A blood. What might their child’s blood type be? | Type A or type O |
| Which combination of sex chromosomes results in a male human being? | XY |
| Why are sex-linked traits more common in males than in females? | A recessive allele on the X chromosome will always produce the trait in a male. |
| Sex-linked genes are genes on | the X and Y chromosomes. |
| A carrier is a person who has | one recessive and one dominant allele for a trait. |
| Many characteristics are affected by interactions between genes and | the environment. |
| Genetic disorders are caused by | DNA mutations or changes in chromosomes. |
| What genetic disorder results in abnormally shaped blood cells? | sickle-cell disease |
| How does a geneticist use pedigrees? | to trace the inheritance of traits in humans |
| What is a pedigree? | a chart that tracks which members of a family have a particular trait |
| What is a karyotype? | a picture of the chromosomes in a cell |
| Cloning results in two organisms that are | genetically identical. |
| In an attempt to produce a potato that tastes good and also resists disease, plant breeders crossed a potato variety that tastes good with a variety that resists disease. This technique is an example of | genetic engineering. |
| Which form of selective breeding crosses parents with the same or similar sets of alleles? | inbreeding |
| Each individual has unique fingerprints. What might you conclude about the inheritance of fingerprint patterns? | Fingerprint patterns are determined by multiple alleles on the same gene. |
| Sex-linked traits that are controlled by recessive alleles are________ likely to show up in males. | more |
| A male is represented by a _____ in a pedigree. | square |
| The technique called ______ produces an organism that is genetically identical to its parent. | cloning |
