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If all the offspring of a testcross are alike and resemble the organism being tested then is the parent homozygous?
Not necessarily. The offspring being alike and resembling the organism being tested is an indication of the parent being homozygous for the traits being tested, but it is not a definitive proof. Further tests or observations would be needed to confirm the parent's genotype.
If two parents are both blood type B and they have three type B offspring and one type O offspring determine the genotypes of the parents whether they are heterozygous or homozygous?
They must both be OB (heterozygous). * OB produces B type * BB produces B type * OO produces O type We project that 1/4 of offspring will be BB, 1/2 will be OB, and 1/4 will be OO. Since BB and OB have the same phenotype (blood type B), statistically 3/4 will be type B and 1/4 will be type O.
What are the blood types possible in offspring if both parents are type O?
We are looking for the possible blood types of a baby.Parental information:Mother type O --can only be OO = contributes the O geneFather type AB --can only be AB = contributes A and B genesBaby receives one gene from each parent: Baby is type AO = Type ABaby is type BO = Type BGenerally speaking, with these parents there would be a 50% chance of either having a Type A or Type B baby. HOWEVER: There is more to ABO blood typing that just the ABO gene.There is also an inhibitory gene that will change any genotype into the phenotype O.Therefore a person with genetically AB blood can be tested as having Type O.If the Type O parent has the inhibitory gene affecting his Type A, B or AB blood, then other blood types for the baby are possible.
Which blood types cannot produce a child with blood type o?
Several ways, and here is why. First, some definitions. PHENOTYPE is how the trait is physically displayed in the person, so a person's blood type is actually their phenotype. GENOTYPE is the pair of genes that a person carries that determines their phenotype. A RECESSIVE gene is one "trumped" by a DOMINANT gene in the genotype; for blood typing, O is the recessive gene and A and B are dominant. For a person to show the recessive phenotype, they must carry BOTH recessive genes. So, in order for the baby to be type O it must carry two O genes and have genotype "OO". The baby will inherit one gene from the mother and one from the father and, as explained above, both must be O genes. Obviously, a parent with type O blood will pass on an O gene, this is all they can do. But there is also a chance a parent with type A or type B blood can pass on an O gene. This is because a parent with genotype AO will be type A (remember, the A gene is DOMINANT) but can still pass on the O gene. Same with a parent having genotype BO. Only a parent with AB blood cannot have a type O child since they must pass on the A or B gene (in other words, they have no O gene to give).
How is a punnett square a mode for what happens during meiosis?
As I'm sure you know, we get half of our genetic material from each parent, and we have two genes for every characteristic, one from mother and one from father, with the exception of a few traits found on the end of the X chromosome in males, who have an XY configuration and must depend on whichever gene the mother gave for certain characteristics such as color vision and proper blood clotting. During meiosis, egg or sperm cells are formed when our chromosomes are split in half to allow for the fertilization process to complete the genetic codes from the other parent. A Punnett square can be used to predict only which possible gene might be given by a single egg or sperm cell based on genotype of the parent, if known, but it is incomplete without the other portion of the code. However, it can be used to show how one parent may contribute either a dominant or recessive gene for a particular trait if the parent's complete genotype is known. For example, I know that my blood type is A, which is my phenotype, but that my genotype is AO because my father was type O and that is the only gene a type O person can donate. Type O genes are recessive, so that phenotype would not show up if someone inherits either a type A or type B gene from the other parent, but the type O gene would have a 50-50% chance of ending up in my egg cells after meiosis split my blood type gene combination (AO), called the genotype, in half. Half of my eggs would therefore contain type A genes and the other half would have type O genes, and that could be put on a Punnett square to show the 50-50% chance of my offspring having either type A or type O blood, depending on which gene he inherits from me, but the father's genotype is needed to complete the full Punnett square possiblities. Since my husband is type O, he could donate only an O gene in every sperm cell, which means that his meiotic Punnett square would have only type O genes in every square. For a true genetic prediction, both genotypes of each parent must be combined, but at least in meiosis, it can be predicted that I have a 50-50% chance to donate either a type A gene or a type O gene to my offspring, while my husband has a 100% chance to donate a type O gene because his genotype has to be OO. Our son, therefore must be either type A or type O and has a 50% chance of having either. We don't know because his blood type has never been tested, but those are his only possibilities. Since neither my husband nor I have type B genes, it would be impossible for our child to have type B or AB blood, which could be deduced from a Punnett square for meiosis for his mother and his father since our genotypes for this trait are known positively. I hope this helped!
How is a genetic test cross helpful?
A genetic test cross is helpful in determining the genotype of an individual with unknown genotype by crossing it with a homozygous recessive individual. This allows the alleles to separate and be observed in the offspring, providing information on the genotype of the individual being tested.
If all the offspring of a testcross are alike and resemble the organism being tested then is the parent homozygous?
Not necessarily. The offspring being alike and resembling the organism being tested is an indication of the parent being homozygous for the traits being tested, but it is not a definitive proof. Further tests or observations would be needed to confirm the parent's genotype.
What does a 1 to 1 phenotypic ratio in a test cross indicate?
A 1:1 phenotypic ratio in a test cross indicates that the organism being tested is heterozygous for a particular trait and is crossed with a homozygous recessive individual. This ratio suggests that the dominant and recessive traits are expressed equally among the offspring, with half exhibiting the dominant phenotype and half exhibiting the recessive phenotype. It confirms the presence of both alleles in the heterozygous parent.
What do all the traits Mendel tested have in common?
All the traits Mendel tested were controlled by single genes that exhibited either dominant or recessive inheritance patterns. These traits also showed clear Mendelian ratios in the offspring of crosses between individuals with contrasting traits.
How did gregor Mendel become famous?
He discovered dominant and recessive alleles. He also bread and tested 29,000 pea plants
If two parents are both blood type B and they have three type B offspring and one type O offspring determine the genotypes of the parents whether they are heterozygous or homozygous?
They must both be OB (heterozygous). * OB produces B type * BB produces B type * OO produces O type We project that 1/4 of offspring will be BB, 1/2 will be OB, and 1/4 will be OO. Since BB and OB have the same phenotype (blood type B), statistically 3/4 will be type B and 1/4 will be type O.
When is a character said to be dominant?
Hello there, Dominant and recessive traits can be tested by reproduction. For example, if I was to grow a tall pea plant and a short pea plant that are true breeds, and if I was to cross pollinate them to form a hybrid pea plant, the new pea plant offspring would exhibit the dominant trait out of tall and short (In this case tall). When reproduction occurs, two alleles for a given gene will be introduced, and only the dominant trait will be used and exhibited by the offspring. That way, if we want to determine whether a trait is dominant, we will need to test through reproduction. Hope this helps!
Can you use not tested on animals products on animals?
It will depend on the individual product. The two statements you are referencing are "Not tested on animals" and "For animal use". The phrase "not tested on animals" means the product was not tested for human safety on animals - it is a humane statement, not a statement of toxicity. The phrase "for animal use" means the product is intended for use on animals, but it may or may not have been tested on animals prior to marketing.
Magic Johnson aids?
He has tested positive for the HIV virus. This does not mean he has Aids, but the two have been shown to have a string connection. There are a few cases where the individual has tested positive and not had te virus and vice versa.
Can genes fixed with gene therapy be transferred to offspring?
I do not personally work in that field but have studied it for a long time. This can be done, it was mainly tested on goats. Their offspring were deformed or perfectly fine. Same as when they did this to try to clone pets. The turn out the same, die right away or are deformed. My answer is Yes, both when you add it after their born or to their mother before they were born.
When Mendel crossed pea plants that differed in two characteristics such as flower color and plant height what happended?
Mendel observed that the traits for flower color and plant height segregated independently of each other during inheritance. This led to the formation of new combinations of traits in the offspring, demonstrating the principle of independent assortment.
What is unit testing?
Unit testing is a software testing method by which individual units of source code are tested to determine whether they are fit for use.
