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14 Cards in this Set
- Front
- Back
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The following is an exmaple of what?
The type of inheritance shown when a red flowering plants is crossed with a white flowering plant and only pink-flowering plants are produced. |
The type of inheritance shown when a red flowering plants is crossed with a white flowering plant and only pink-flowering plants are produced is INCOMPLETE DOMINANCE.
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What is a trait controlled by four alleles?
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a trait controlled by four alleles is said to have MUTIPLE ALLELES.
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What is a sex chromosomes?
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The 23rd pair of chromosomes that differ in male and females are SEX CHROMOSOMES.
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What alleles is controlled by the following example?
When roan cattle are mated 25% of offsprings are red, 50% are roan and 25% are white. Upon examination, it can be seen that the coat of a roan cow consists of both red and white hairs. |
This trait is one controlled by CODOMINANT ALLELES.
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What is incomplete dominance?
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Situation in which one allele for a gene is not completely dominant over anover allele for that gene are called IN
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The following is example of what type of inheritance?
A cross of a black chicken (BB) with a white chicken produced all speckled offspring (BBWW) |
INCOMPLETE DOMINANCE
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Variation in human skin color is an example of what?
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Variation in human skin color is an example of POLYGENIC TRAITS.
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What are sex linked traits?
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Traits controlled by genes located on the X or Y chromosomes are SEX LINKED TRAINTS.
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Humans have how many pairs of autosome type of chromosomes?
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Humans have 22 many pairs of autosome type of chromosomes
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What is incomplete dominance?
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Incomplete dominance is when the phentype of the heterozygote is intermediate between thos phenotypes expressed by the homozygotes.
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What are codominant alleles?
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When phenotypes of both homozygotes are produced in the heterozygote, they are called codominant alleles.
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Discuss how the external environment of an organism can affect gene function?
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Temperature, light, nutrition, chemicals and infectious agents can all influence genes. Example resulting from difference in temperature include colors in some bacteria and patterns in the coat color of rabbits. similar phenotoypes are controlled by many other genes in organisms.
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What is polygenic inheritance?
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The ineritance pattern of a trait controlled by two or more genes is POLYGENIC INHERITANCE.
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Discuss how the internal environment of an organism can affect gene function?
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Age, gender, sex hormones are three factors in the internal environment that can make a difference in gene function. Some traits such as horns or breast development are expressed differently in the sexes. Often, the genes that determine one phenotype depend on the function by different set of genes.
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