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| any chromosome other than a sex (Xor Y) chromosome |
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Does not express the trait by are capable of having a child with a gentetic disorder
-can happen when the condition is dominant and the parents are Aa |
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an example is the inheritance of the ABO blood group in humans
Inheritance patterm in which both alleles of a gene are equally expressed in a heterozygote. |
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Definition
cross between parents that differ in two traits
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| What phenotypic ratio is expected when two dihybrids reproduce? |
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Definition
| A ratio of 9:3:3:1 is always the expected pheotypic ratio of a dihybrid cross. |
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Polygenic trait that is subject to enviromental affects.
-or-
Allele that exerts its phenotypic effect in the heterozygote
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Visible expression of a genotype
e.g., brown eyes or attached earlobes |
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Inheritance pattern in which the offspring has an intermediate phenotype,
as when a red-flowered plant and a white-flowered plant produce a pink flowered plant |
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| pattern of inheritance in which a trait is controlled by several allelic pairs; each dominant allele contributes to the phenotype in an additive and like manner |
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| the study of gene frequencies and their changes within a population |
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| Mendel's pea plants were_____________for the tall-dominant trait |
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Definition
homozygus
(two alleles are the same ) |
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| __________ is the process Mendel used to pollinate flowers of short plants with pollen from tall plants. |
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Definition
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| Which pait of chromosome produces a male offspring? |
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Definition
| a female X chromosome and a male Y chromosome |
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| Which is a tool that is used to predict genetic crosses? |
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Definition
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| Which is true of mutations in DNA? |
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Definition
A mutaion might have no effect on an organism
(note not all mutations are harmfull
likewise all are not beneficial to an organism)
(some may have an effect
while others may have no effect) |
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| Which process seperates chromosomes? |
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Definition
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| What influences whether the gene for brightly colored feathersis expressed in a bird? |
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Internal influences (Internal and external enviromental influences can be a factor in wherther or not a gene is expressed.) |
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| Which of these is an organism that produces the same traits in every generation? |
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Definition
A purebred
A hybrid
A chromosome
A pea planr |
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| This is a trait produced by a combination of multiple genes |
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Definition
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| What controlls traits in organisms? |
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unit of heredity existing as alleles on the chromosomes;
in diploid organisms, typically two alleles are inherited- one from each parent |
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| Cell condition in which two of each type of chromosome are present. |
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| Cross between parent that differ in two traits |
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| A person with phenotype A blood has how many possible genotypes? |
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Definition
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| A person with phenotype O blood has how many possible genotypes? |
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Definition
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| Which of these describles the allele that causes color blindness? |
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Definition
Present only in males
carried on the Xchromosome
dominant
carried on the Y chromosome |
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Term
| Blood types in humans are an example of traits controlled by |
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Definition
pedigree
multiple alleles
offspring
only homozyfus parents |
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