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Eye colour is not controlled by a single gene, it is a combination of different genes that will ultimately dictate your eye colour. To understand this, we will first consider one of the genes involved. There are two alleles for this one gene, either 'blue' or 'not blue' eyes. A person who inherits a 'blue' allele from both parents will have blue eyes, ie we say that their phenotype (how they appear)is blue. A person who inherits a 'blue' allele from one parent and a 'not blue' allele from the other will have a phenotype (appearance)of 'not blue' eyes because 'not blue' is dominant over 'blue'. Then we must consider another gene that is involved. if you inherit 'not blue' eye colour then this other gene that you inherit will kick in and give your eyes some colour. A small amount of colour (melanin pigment) will make your eyes grey. More and more of this pigment can make them green, then hazel and then brown. eg - A blue eyed man (both his parents therefore must have had blue eyes) , married to a brown eyed woman (who had one parent 'blue' and the other 'not blue') could have children with blue, grey, green, hazel or brown eyes.
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State the conclusions reached by mendel in his work on the inheritance of characteristics?
- Some "alleles" (hereditary traits) are dominant, and others are recessive. - If a pure dominant trait is bred with a recessive trait, their offspring will show 75% presence of the dominant trait, and 25% presence of the recessive trait in the F1 (first filial) generation. - If a plant with a dominant trait from the F1 generation (carrier, heterozygous dominant) is bred with a plant that shows a recessive trait, their offspring will display at 50/50 probability of dominance versus recessiveness. Thus, alleles expressing a particular trait via dominance/recessiveness, in the case of the pea plants, take the form of two alleles that combine to express a particular version. This later has been shown to be homozygous dominance/recessiveness, or heterozygous dominance.
What would happen if you cross the offspring of two pink roses?
When a red flower crosses with a white flower, it can create a pink flower. Why? Because of incomplete dominance. Incomplete dominance is when the heterozygous phenotype(offspring) is a blend of the two homozygous phenotypes(parents).
One allele is not completely dominant over another The heterozygous phenotype is somewhere in between the two homozygous phenotypes?
You get aspects of each trait displayed. Like, if one cat had a solid colored orange fur, and it's mate was brown, you could get a mottled cat. Or if one parent has brown eyes, and the other green, hazel eyes could occur.
A researcher studying inheritance found that when black mice were crossed with white mice all the offspring produced were gray What is this an example of?
This is an example of incomplete dominance.
The mutations that breeders induce in organisms are passed on to the organisms?
offspring
Which of Mendels principles explain why the offspring is albino?
The principle of dominance and recessiveness explains why the offspring is albino. Albinism is a recessive trait, meaning that both parents must carry at least one copy of the albino gene in order for it to be expressed in the offspring. This demonstrates how traits can be masked in one generation and expressed in the next through Mendelian genetics.
What is a fraction of phenotypes that appear in offspring?
The fraction of phenotypes that appear in offspring is determined by the genetic makeup of the parents and the manner in which traits are inherited. For example, in a simple Mendelian inheritance scenario, offspring may exhibit a 3:1 ratio of dominant to recessive phenotypes for a single trait. If multiple traits are considered, the ratios can become more complex due to independent assortment and gene interactions. Overall, the specific fractions depend on the genotypes of the parents and the dominance relationships of the alleles involved.
What happened to the proportions of the two phenotypes as the F1 generation grew from 10 to 100 offspring?
The proportions of the two phenotypes in the F1 generation remained constant as the number of offspring increased from 10 to 100. This is because the inheritance of traits follows Mendelian principles, and the ratio of phenotypes will only change if there is an assortment such as independent segregation.
If an offspring shows a phenotype that is intermediate between the phenotypes of the parents what is this type of inheritance?
Incomplete dominance can create offspring that display a trait not identical to either parent but intermediate to the two. One example of incomplete dominance is a red flower and a white flower crossbreed to form a pink flower.
If a tall round seed plant is crossed with another tall round seed plant Tall dominant and both heterozygous?
The offspring will likely exhibit the tall phenotype due to the dominance of the tall allele. The genotype of the offspring would be TtRr, with a combination of dominant and recessive alleles for both height and seed shape. This type of cross would result in a 9:3:3:1 ratio of phenotypes in the offspring according to Mendelian genetics.
What are the phenotypes possible for a hybrid tall parents?
When considering hybrid tall parents, the phenotypes of their offspring can vary depending on the genetic makeup of the parents. If both parents are homozygous tall (TT), all offspring will be tall (TT). If one parent is homozygous tall (TT) and the other is heterozygous tall (Tt), all offspring will also be tall (TT or Tt). However, if both parents are heterozygous (Tt), the offspring can exhibit three possible phenotypes: tall (TT or Tt) and short (tt), following a typical Mendelian ratio of 3 tall to 1 short.
A homozygous blue flower BB is crossed with a homozygous white flower bb What are the possible genotypes and phenotypes of the offspring?
The possible genotypes of the offspring are Bb (heterozygous blue) and bb (white). The possible phenotypes are blue and white flowers. Each offspring will inherit one allele from each parent, resulting in a 50% chance of being blue (Bb) and 50% chance of being white (bb).
When a cross between a red flower and a white flower yeilds pink offspring the trait is?
Incomplete dominance, where the heterozygous phenotype is an intermediate blend of the two homozygous phenotypes.
How does incomplete dominance work in genetic inheritance?
Incomplete dominance occurs when neither allele is completely dominant over the other, resulting in a blending of traits in the offspring. This means that the phenotype of the heterozygous individual is a mix of the phenotypes of the two homozygous parents.
What are the possible phenotypes of the offspring from the cross of the parental plants with yellow and red?
The possible phenotypes of the offspring from a cross between yellow and red parental plants depend on the inheritance pattern of the traits. If yellow is dominant over red, the offspring could display either yellow or red phenotypes, with yellow being more prevalent. If the traits follow incomplete dominance, the offspring might show a blend of the two colors, resulting in orange. The exact phenotypic ratios would also depend on whether the parental plants are homozygous or heterozygous for their respective colors.
How do you describe a pattern of inheritance that the blending hypothesis fails to explain?
A pattern of inheritance that the blending hypothesis fails to explain is incomplete dominance, where the heterozygous phenotype is intermediate between the two homozygous phenotypes. This contradicts the blending hypothesis, which suggests that the traits of the parents are mixed together in the offspring. In incomplete dominance, the traits remain distinct in the offspring.
What phenotypes are possible for pea offspring of this cross?
To determine the possible phenotypes of pea offspring from a cross, it would depend on the specific traits and alleles being considered. For example, if crossing a homozygous dominant plant for tallness (TT) with a homozygous recessive plant for shortness (tt), all offspring (Tt) would exhibit the dominant phenotype, which is tall. If you include heterozygous plants or multiple traits (like seed color), the phenotypic ratio would vary accordingly. Overall, the phenotypes depend on the alleles involved in the cross and their dominance relationships.
