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Ch 16 Review
Chapter 16 Review
| Question | Answer |
|---|---|
| _________________ are the physical characteristics that are studied in genetics. | Traits |
| Scientists call the factors that control traits ______________. | genes |
| The different forms of a gene are called _________________. | alleles |
| A __________ allele is one whose trait always shows up in the organism when the allele is present. | dominant |
| A _______________ has two different alleles for a trait. | hybrid |
| TT means that two ________________ alleles are present. | dominant |
| Tt means that one ___________ and one __________ allele are present. | dominant and recessive |
| tt means that two _______________ alleles are present. | recessive |
| ______________ is the likelihood that a particular event will occur. | Probability |
| A ____________ ______________ is a chart that shows all the possible outcomes of a genetic cross. | punnett square |
| An organism’s _______________ is its physical appearance. | phenotype |
| An organism’s ___________________ is its genetic makeup. | genotype |
| An organism that has two identical alleles for a trait is said to be ______________. | homozygous |
| A _________________ organism has two different alleles for a trait. | heterozygous |
| In _______________, the alleles are neither dominant nor recessive. | codominance |
| Genes are located on _______________. | chromosomes |
| According to the _____________________________________, genes are carried from parents to their offspring on chromosomes. | chromosomal theory of inheritance |
| When sex cells combine, each sex cell contributes ____________ the normal number of chromosomes. | half |
| The _________________ is the order of nitrogen bases along a gene. | genetic code |
| Protein synthesis takes place on the ___________________ in the cytoplasm of the cell. | ribosomes |
| Adenine, guanine, cytosine and thymine are ______________ bases. | DNA |
| Adenine, guanine, cytosine and uracil are ________________ bases. | RNA |
| __________________ copies the coded message from the DNA in the nucleus, and carries the message into the cytoplasm. | messanger RNA |
| ________________ carries amino acids and adds them to the growing protein chain. | transfer RNA |
| Any change that occurs in a gene or chromosomes is called a _____________. | mutation |
Created by:
lschramme
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