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What is an example of a different form a gene may have for a trait?
The different forms of a genes for a single trait are known as alleles there can be a dominate allele which always shows up when present and a recessive allele which only shows up when both alleles are recessive or there is no dominate allele
What combination of alleles could produce a trait controlled by a dominant allele?
genotype
Why do you have to pull two alleles (two straws) from the bag to represent one fish?
For most organism's any trait is usually determined by two alleles/"genetic codes" for that trait (one from each parent). For example, your eye or hair color results from a combination of your mother and father's genes (one allele from each for hair/eye color). So, a specific trait for a fish follows the same process by which two alleles (one from each parent) are needed to represent the fish.
What are multiple allele traits?
A polygenic trait that require the additive effects of many alleles to be expressed. Height is an example of a polygenic trait. Or, a trait that has many alleles to fill the loci on chromosomes. Blood types are examples of this. A, B and O are all alleles that git the two chromosomal loci, but only any two at once whether homozygous or heterozygous.
What kind of allele must an organism inherit in order for a recessive trait to show up?
Neither of the parents will be affected. There may not be any one with he disease in either of the parents families (or there might be). Since each parent is a carrier and has a 50/50 chance of passing one copy of the gene to each child 1/4 of the children will not get the gene, 1/2 will be carriers (1 copy) and 1/4 wil be affected (2 copies).
For each trait there are allele possibilities?
Yes, that is correct. Each trait is controlled by genes, and genes exist in different forms called alleles. For any given trait, an individual can have two alleles—one inherited from their mother and one from their father. These alleles can have different variations, resulting in different expression of the trait.
What is an example of a different form a gene may have for a trait?
The different forms of a genes for a single trait are known as alleles there can be a dominate allele which always shows up when present and a recessive allele which only shows up when both alleles are recessive or there is no dominate allele
Is a Simmental cow horn or poled or both?
Any Simmental animal, regardless of sex, can be horned or polled. The polled trait is dominant and the horned trait is determined by a pair of recessive alleles.
Mendel's law of segregation states that an organism inherits two alleles for any given trait one from each parent?
Mendel's law of segregation states that each organism carries two alleles for a trait, one from each parent, and during gamete formation, these alleles segregate randomly into separate gametes. This results in each gamete carrying only one allele for a given trait.
When a trait has more than two alleles, how is that trait inherited?
Not sure if I understand the question correctly... but any single set of normal allelic pairs would be inherited according to standard Mendelian ratios, but the phenotypic expression would be more complex and would not reflect Mendelian ratios there might be an additive effect of having alleles A, B C as opposed to the recessive complement a, b, c - this would pertain to traits as drosophila wing span, all three dominant alleles result in larger wingspan but this is often complicated by the presence of alleles which can "knock out" the effect of entire complements of alleles, effectively cancelling out expression no matter how many other pro-length alleles are present... it is difficult to talk about in the abstract... :)
Could the zygote ever obtain a heritable trait that it did not get from it's parents?
Yes, because a trait can be hidden for one generation and return in the next. For example, if a girl had red hair, but neither of her parents had red hair, she could have inherited from her grandparents. Therefore, it can be inherited from someone other than your parents.
What is the difference between alleles and multiple alleles?
Alleles refer to different versions of the same gene. So a single gene can have multiple alleles. For example in fruit flies there is a single gene that controls eye color, and the eye color of the fly depends on the alleles they have for that gene (since they have two copies of every gene, being diploid). A polygenic trait refers to any inheritable trait that is controlled by multiple genes, and each of these genes can have multiple alleles. For example, eye color in humans is a polygenic trait. There are at least three different genes, each with multiple alleles, that determine eye color in humans. Polygenic traits don't follow patterns of mendelian inheritance. So in summation the difference is multiple alleles refers to different versions of one gene and polygenic traits refers to a single trait which is controlled by multiple genes (each with multiple alleles) Yes, or: Multiple alleles are "the existence of more than two alleles (versions of the gene) for a genetic traits. Polygenic traits are "[characteristics of organisms that are] influenced by several genes." So multiple alleles are more than two alleles for one trait, and polygenic traits are one trait that is influenced by multiple genes. This information came from my biology textbook, "Biology: Principles and Explorations" by Holt, Rinehart, and Winston.
What is the genotype any time a recessive trait shows up?
The genotype for a recessive trait to show up is typically homozygous recessive (aa), meaning both alleles are the same and both are recessive.
What combination of alleles could produce a trait controlled by a dominant allele?
genotype
What organism has two different alleles for the same genetic trait?
homozygousHomozygousit means homozygous. if both alleles are recessive, the trait will be homozygous recessive. if both alleles are dominant, then the trait is homozygous dominant.An allele is a letter representing the alternative forms of a gene. In most cases, there will be a dominative allele, written as the capital letter (in this case, H, although the allele can be any letter), and there will be a recessive allele, written as the lowercase of the same letter as the dominative allele for that particular trait (h).These alleles can be homozygous (both the same, such as in a purebreed) eg HH or hh. On the other hand, they can also be heterozygous, meaning that the gene has one dominative allele, and one recessive allele. This is written as Hh.When something that is homozygous (either homozygous dominant, HH, or recessive, hh,) is bred with another homozygous that is the same, the offspring will have two identical alleles. For example, a plant that is homozygous with the alleles HH to produce the trait of red flowers, is pollinated by another plant, also homozygous HH for the trait of red flowers. The offspring will also have the homozygous alleles HH and will be a pure bred for red flowers.Such is the case for anything. If a gene has two alleles that are identical, it will be purebred for that particular trait produced by those alleles.homozygousIs homozygousl.homozygoushomozygous
Why do you have to pull two alleles (two straws) from the bag to represent one fish?
For most organism's any trait is usually determined by two alleles/"genetic codes" for that trait (one from each parent). For example, your eye or hair color results from a combination of your mother and father's genes (one allele from each for hair/eye color). So, a specific trait for a fish follows the same process by which two alleles (one from each parent) are needed to represent the fish.
What are multiple allele traits?
A polygenic trait that require the additive effects of many alleles to be expressed. Height is an example of a polygenic trait. Or, a trait that has many alleles to fill the loci on chromosomes. Blood types are examples of this. A, B and O are all alleles that git the two chromosomal loci, but only any two at once whether homozygous or heterozygous.
