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A brown mouse is repeatedly mated with a white mouse all the offspring are brown if two of the offspring are mated what fraction of the F2 mice will be brown?
75% or 3/4. The two F1 (offspring) mice have a genotype Bb, and express the dominant (brown) trait. When they mate, 1/4 will be BB (homozygous dominant - brown), 2/4 will be Bb (heterozygous - brown), and 1/4 will be bb (homozygous recessive - white).
Show the cross between 2 heterozygous dogs. black fur B is dominant to brown fur b?
The Punnett square for crossing two heterozygous dogs (Bb x Bb) would result in a 25% chance of offspring with homozygous dominant black fur (BB), a 50% chance of offspring with heterozygous black fur (Bb), and a 25% chance of offspring with homozygous recessive brown fur (bb).
How does heterozygous and homozygous differ?
Homozygous refers to having two identical alleles for a particular gene, either dominant or recessive, while heterozygous refers to having two different alleles for a particular gene. For example, in a homozygous dominant individual, both alleles for a gene are dominant, whereas in a heterozygous individual, one allele is dominant and the other is recessive.
What happens when a dominant and recessive allele are both present?
The resulting offspring will have the dominant trait. It depends on if the dominant is hetero or homo...if it was homozygous then your offspring will have a hetozygous trait showing the dominant trait (to clear this up if you are confused lets say we are talking about brown eyes(BB-dominant) vs blue eyes(bb-recessive)--a homozygous would give you a brown eyed child with Bb and but if the person is heterozygous Bb and gets with a recessive you have a chance of getting Bb or bb giving you a possibility of a brown or blue eyed child)...wow i just made that way more confusing than it had to be
What is two dominant alleles called?
In eyes, it would be brown is dominant, and blue is recessive. Free earlobe allele is said to be dominant over the attached earlobe allele. When an organism has two dominant alleles for a trait, it is called homozygous dominant. Two recessive alleles for a trait is homozygous recessive.
A trait that is masked by a dominant trait is called?
DNAactually it is not DNA at all, a dominant trait, masks a recessive trait.
Out of 200 offspring of heterozygous brown rabbits and white rabbits how many white rabbits would be expected?
Half of the offspring, or 100 rabbits, would be expected to be white when offspring from a heterozygous brown rabbit and a white rabbit are produced. This is due to the dominant-recessive inheritance pattern where brown is dominant and white is recessive.
A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (White is the recessive color)?
A pretty bow
What is the difference between homzyguos and heterozyous?
Homozygous recessive: is when the genes are both recessive Homozygous dominant: is when the genes are both dominant (traits show) Heterozygous dominant: is when one gene is dominant and one is recessive (traits show) Heterozygous recessive: is the same as heterozygous dominant but the dominant genes are inactive
Is eye color a homozygous recessive genetic disorder?
Eye color is not considered a genetic disorder; it is a polygenic trait influenced by multiple genes. The genetics of eye color are complex and involve a combination of dominant and recessive alleles from different genes. It is not classified as a disorder as it does not cause harm or impairment to an individual's health or functioning.
What percent is homozygous recessive?
Here's an example: two chickens have the phenotype of white feathers and brown feathers. What percentage of the chicks will have the recessive color? First, you have to see the parents' phenotypes. To get the answer, a good trick is to use the box. Draw a box and cut it into 4 pieces. Put one of the parent's phenotypes (w and B) on the top, and the other parent's (w and B) on the right side going down. Whichever trait is dominant (brown) MUST be capitalized. Then, cross the two parents. first box on the top left would read 'ww.' The one below it is 'Bw' (put the dominant first). The right top is 'Bw' and the one below it is 'BB'. So if there were 4 offspring, these would be their genotypes: 'ww', 'Bw', 'Bw', and 'BB'. The only offspring that would have the recessive trait is the 'ww' child, because dominant overpowers recessive. So 25% would have the recessive trait and 75% would have the dominant trait! Good luck, and the box may be confusing now, but it does work!!!
What genotype results in the same phenotype?
A phenotype is the actual result that you can actually see, whereas the genotype is the allele or gene that causes the phenotype. Lets say that brown hair is dominant and which is caused by an allele that we'll represent with B, and lets say that red hair is cause by a recessive allele that we'll represent with b. A genotype is represented by a combination of 2 of these alleles. So we have BB, Bb and bb as our possible genotypes of the child. One of the alleles is from the mom and the other from the dad. BB means that both of the parents have brown hair, which means the offspring will have brown hair, and since both parents have brown hair and brown is dominant, we call the offspring homozygous dominant for that genotype. Homozygous means the same. Bb means that on parent has brown hair and the other has red hair or at least carries the red hair trait. This offspring will have brown hair because B is dominant over b. We call this heterozygous dominant. Heterozygous means different. Last we have the bb. this means that either both parents have red hair or both have the traits for red hair. This offspring will have red hair because they do not have any dominant genes. This is called homozygous recessive. Now this is just an example. hair color is gets much more complicated then this but that's the basic idea for all genotypes and phenotypes. I hope this helps at least some.
