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Some animals such as cows normally produce only one offspring from each mating If a cow showed a dominant phenotype why would a typical testcross be a difficult way to determine the genotype?
Because a cow only produces one offspring at a time, not several like mice, cats, dogs, flies or frogs do. In order to have a successful test cross, the species of animal used must have at least 10 to 20 offspring to study from.
How could a guinea pig breeder whether a rough-coated guinea pig is homozygous or heteorzygous for this trait?
A breeder could determine if a rough-coated guinea pig is homozygous or heterozygous by conducting a test mating. Breeding the rough-coated guinea pig with a smooth-coated guinea pig would show if the rough coat is dominant or recessive. If all the offspring have rough coats, it indicates the rough-coated guinea pig is homozygous for the trait. If both rough and smooth-coated offspring are produced, then the rough-coated guinea pig is heterozygous.
What offspring are expected from mating a roan bull and a roan cow?
Mating a roan bull with a roan cow typically produces offspring that can also be roan, red, or white, depending on the genetics involved. Roan coloration is a result of the interaction between two alleles, where one is dominant (roan) and the other is recessive (red or white). The expected ratio of the offspring would be approximately 25% red, 50% roan, and 25% white, based on Mendelian genetics. However, specific outcomes can vary due to the genetic makeup of the parents.
What are a lion's mating habits?
Lions are typically polygynous, with a dominant male forming a pride of females for mating. Mating can occur multiple times a day for several days during a female's estrus cycle. The dominant male in the pride will fiercely protect access to the females from other males.
What was the result when Morgan mated fruit flies with the phenotypes XRXr and XRY?
When Morgan mated fruit flies with the phenotypes XRXr (female) and XRY (male), the expected offspring would include XRXR (homozygous female), XRXr (heterozygous female), and XRY (male). This would result in a phenotypic ratio where half of the offspring are females showing the dominant trait (XRXR and XRXr) and half are males (XRY). The specific traits exhibited would depend on the dominance relationships of the alleles involved. Overall, the mating would reveal insights into sex-linked inheritance patterns in fruit flies.
What becomes of a YY genotype?
In mice the YY genotype is lethal during embryonic development. This means that the mating of heterozygous individuals will produce a ratio of 2:1 Yy to yy offspring.A 'YY' genotype is homozygous dominant for that particular trait. If it is Yy, it will be heterozygous.
What cross shows homozygous dominant mating with heterozygous?
AA (dominant) mating with aa (recessive) -----> Aa
What would mating between a true breeding purple flowered pea plant and a true breeding white flowered pea plant produce?
Make a Punnet Square:White HETEROZYGOUS---WwRed HOMOZYGOUS--ww (this one is recessive because the white characteristic dominated in the heterozygous type)So:W ww Ww www Ww wwThese four are the potential types of the offspring, they will either be HETEROZYGOUS WHITE or HOMOZYGOUS RED, no homozygous white
What are the predicted ratio of ofsprings in a mating of AAA and AAA?
The predicted ratio of offspring in a mating of AAA and AAA would be 100% AAA. Since both parents have the same genotype, all of their offspring will inherit the same genotype.
Which describes the mating of organisms that have different homozygous alleles for a single trait?
When organisms with different homozygous alleles for a single trait mate, they produce offspring that are heterozygous for that trait. For example, if one parent has homozygous dominant alleles (AA) and the other has homozygous recessive alleles (aa), all offspring will be heterozygous (Aa). This can lead to the dominant trait being expressed in the offspring, while the recessive trait remains masked. The genetic variation introduced can significantly influence traits in future generations.
Some animals such as cows normally produce only one offspring from each mating If a cow showed a dominant phenotype why would a typical testcross be a difficult way to determine the genotype?
Because a cow only produces one offspring at a time, not several like mice, cats, dogs, flies or frogs do. In order to have a successful test cross, the species of animal used must have at least 10 to 20 offspring to study from.
Why is it difficult to determine the genotype of an organism that has a dominant phenotype?
NO, because a dominant phenotype could either be homozygous or a heterozygous.so unless you are sure about the genotype of parents we can't determine it...but we can determine the genotype of a person showing reccessive phenotype, as a recessive trait always expresses itself in a homozygous condition...
What is the expected phenotypic ratio resulting from a homozygous dominant?
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
Which breeding method results in the production of offspring with the same genotype as the parents?
Pure breeding through self-fertilization or inbreeding results in offspring with the same genotype as the parents. This method involves mating individuals with homozygous genotypes for specific traits to maintain desired characteristics in the offspring.
What describes the mating of organisms that have different homozygous alleles for a single trait?
The mating of organisms with different homozygous alleles for a single trait is referred to as a monohybrid cross. In this scenario, one parent possesses two dominant alleles (homozygous dominant), while the other has two recessive alleles (homozygous recessive). The offspring produced from this cross will be heterozygous, displaying the dominant trait, while the recessive trait will not be expressed in the phenotype. This type of cross is often used to illustrate basic principles of Mendelian inheritance.
A red-eyed fly mates with a blue-eyed fly. The offspring all have red eyes. What is the dominant trait?
A dominant trait, when present, is always expressed. So if the offspring of a red eyed and blue eyed mating are all red, then red must be dominant because it is the trait expressed.
What is the dominant trait when a red-eyed fly mates with a blue-eyed fly resulting in offspring that all have red eyes?
A dominant trait, when present, is always expressed. So if the offspring of a red eyed and blue eyed mating are all red, then red must be dominant because it is the trait expressed.
