What is the expected phenotypic ratio resulting from a homozygous dominant x heterozygous monohybrid cross?

The expected phenotypic ratio will be 100% dominant. This is so because if we take AA to be the homozygous individual and Aa to be the heterozygous, the Punnett square will give us the offspring AA, AA, Aa, and Aa. They will all have one dominant allele, resulting in a dominant phenotype.

A homozygous dominant cross? AA X AA Yields all AA ========

The resulting offspring will be 25% tall homozygous, 25% short homozygous, or 50% heterozygous. Depending on the gene, the heterozygous will either have codominance, incomplete dominance, normal dominance depending on which gene is dominantly expressed.

Yes you can accurately determine an organisms genotype by observing it's phenotype, however some phenotypic traits resulting from homozygous or heterozygous combinations of alleles, may make the prediction impossible.

The expected genotype ratio from a heterozygous x heterozygous cross is 1:2:1. For example, in the cross Bb x Bb the genotype ration would be 1BB:2Bb:1bb

The phenotypic ration in F1 generation will be 3 : 1. Three individuals showing dominant trait and one individual with recessive trait. However, the genotypic ratio will be 1:2:1.That is one homozygous dominant, two heterozygous dominant and one homozygous recessive individuals.

Plato users, Heterozygous (Rr), red.

A heterozygous cross. Tt X Tt One homozygous dominant--TT Two heterozygous dominant---Tt One homozygous recessive--tt All on a statistical average outcome.

If red eyes are dominant, then 75% will have red eyes and 25% will have white eyes. The genetic breakdown is: 25% will be RR (homozygous red eyes), 50% will be Rr (heterozygous red eyes) and 25% will be rr (homozygous white eyes).

Heterozygous - White gene carrier Homozygous - No white gene White tigers are not albinos and do not constitute a separate subspecies of their own and can breed with orange ones, although all of the resulting offspring will be heterozygous for the recessive white gene, and their fur will be orange. The only exception would be if the orange parent was itself already a heterozygous tiger, which would give each cub a 50% chance of being either double-recessive white or heterozygous orange. If two heterozygous tigers, or heterozygotes, breed on average 25% of their offspring will be white, 50% will be heterozygous orange (white gene carriers) and 25% will be homozygous orange, with no white genes. In the 1970s a pair of heterozygous orange tigers named Sashi and Ravi produced 13 cubs in Alipore Zoo, of which 3 were white. If two white tigers breed, 100% of their cubs will be homozygous white tigers. A tiger which is homozygous for the white gene may also be heterozygous or homozygous for many different genes. The question of whether a tiger is heterozygous (a heterozygote) or homozygous (a homozygote) depends on the context of which gene is being discussed. Inbreeding promotes homozygosity and has been used as a strategy to produce white tigers. (From Wikipedia)

(medicine) A hereditary form of hemolytic anemia resulting from a defective synthesis of hemoglobin: thalassemia major is the homozygous state accompanied by clinical illness, and thalassemia minor is the heterozygous state and may not have evident clinical manifestations. Also known as Mediterranean anemia.

becouse you touch yourself at night.

If both parents are true breeding with the same phenotype all the offspring will have the same phenotype and genotype as the parents. Parents and offspring will all be homozygous. If both parents are true breeding with different phenotypes the resulting offspring will be heterozygous and their phenotype will match the dominant characteristics of the parents. If one parent carries all the dominant characteristics all heterozygous offspring will have the phenotype of that parent. If each parent homozygous but carries both dominant and recessive alleles the offspring will be heterozygous and match the dominant traits of the respective parents. Ex. Parent1 is AAEEddbb Parent2 is aaeeDDBB the offspring will be genotypically and phenotypically identical AaEeDdBb but will display a 100% dominant phenotype and be 100% genotypically heterozygous.

I will use a simple example of Height...... T (tall) is dominant over t (short). So we have 2 ways to make a tall offspring: TT and Tt 't' is a recessive trait so it will take two 't's together to make a short offspring: tt Homozygous dominant means it has 2 of the same allele, and that this allele is the dominant one. So T T Heterozygous means it has 2 different alleles. So T t A monohybrid cross simply means "find out how this gene is inherited by the offspring". To answer the question we put the parents (TT and Tt) in a punnet square... .....T.......T T....TT...TT t.....Tt....Tt The phenotype (how they actually look) is tall for all 4 of them. TT is tall and Tt is also tall (even though they have a short 't' allele, the tall 'T' allele is dominant, making them tall anyway. Therefore the ratio of tall to short is 4:0 which can be reduced to 1:0

Remeber that when creating a zygote (baby) each parent contributes one copy of each chromosome so the resulting individual has two sets of chromosomes (two copies of 23 chromosomes for a resulting 46 chromosomes in humans) Homozygous means that both of the parents have given the same allele (for example both parents have blue eyes) they can give two dominant or two recessive alleles. Heterozygous means each parent gave the baby a different allele (option) such as if one parent had blue eyes and one parent had brown eyes. The dominant allele (in this case the brown eye color) would be expressed (used)

Buckskin or Smoky Black

f1 is the first generation when 2 true breeding (1 in homozygous dominant and other homozygous reccesive ) is crossed , then the resulting offspring are called f1 generation

Cross the purple (flowered) pea plant with a white (flowered) pea plant if all plants produced from this cross are purple the original purple parent is homozygous dominant. If the purple plant is heterozygous crossing with a homozygous recessive/white pea plant will result in offspring with a purple to white ratio of 1:1. If this cross is being done without knowing whether purple is dominant or recessive a cross of a white with a purple plant can be done to some effect in determining the status of each parent. First assumption is that one of the parent plants has to be homozygous recessive. If all offspring from the resulting mating are purple: purple is dominant and this parent is homozygous. The white plant is homozygous recessive in this case. If all offspring from the resulting mating are white: white is dominant and this parent is homozygous. The purple plant is homozygous recessive in this instance. If the mating produces a 1:1 ratio of purple to white flowers the only definitive answer is that the dominant parent is heterozygous. Unfortunately an additional mating will be required to determine which color is dominant before a determination can be made regarding the zygousity of the original purple parent. This can be done by crossing white offspring with white offspring and purple with purple offspring. The recessive color mating will produce 100% self colored plants. Therefore, if the mating of purple to purple offspring produces 100% purple offspring the original purple parent was homozygous recessive. If the same purple to purple mating produces some white offspring the original purple parent plant was heterozygous and purple is dominant.

The offspring of the F1 generation is the F2 generation resulting from two heterozygous (Aa) crosses.

That the parents were both heterozygous!

If you have a heterozygous (one dominant and one recessive) individual, it will only express the dominant allele in complete dominance; if it's codominance then some sort of "combined property" resulting from both the dominant and recessive allele would be expressed. On the other hand if you have a homozygous (both dominant or both recessive) you needn't bother.

Plato users, 3/4, 1/4.

A heterozygous condition resulting in the dominant genes expression in the phenotype.

Monohybrid - A genetic cross made to examine the distribution of one specific set of alleles in the resulting offspring Example: tall peas x short peas or TT x tt Dihybrid - Hybridization using two traits with two alleles each. Example: tall peas with round seeds x short peas with wrinkled seeds or TTRR x ttrr

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