| Term | Definition |
|---|
| Human traits are controlled by what type of gene(s)? | single genes with two alleles, single genes with multiple alleles, many genes that act together |
| A widow's peak and free or attached earlopes are controlled by what type of gene(s) | a single gene with two alleles |
| Human blood type is controlled by what type of gene(s)? | a gene with multiple alleles |
| True | Even though a gene may have multiple alleles, a person can carry only two of those alleles. |
| False - pairs | Chromosomes exist in sets of three. |
| Give three examples of inheritance in humans. | single genes with 2 alleles, single genes with multiple alleles and many genes that act together. |
| Give an example of a trait that follows a single gene with 2 alleles pattern. | attached earlopes or widow's peak or pea plant stem size |
| Give an example of a trait that is controlled a single gene with multiple alleles pattern. | human blood type |
| Give an example of a trait that is controlled by many genes. | height in humans |
| Why do some traits exhibit a large number of phenotypes? | Because their traits is controlled by many different genes which when grouped together form a single trait. |
| What sex will a child be if a sperm with a Y chromosome fertilizes an egg? | Male - |
| Truel | A sperm cell contains an X and Y chromosome. |
| False - XX | An egg cell contains two Y chromosomes. |
| True | There is a 50% probability that a child will be a girl or boy when a sperm cell fertilizes an egg. |
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