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What is A pattern of inheritance in which neither allele is phenotypically dominant to the other?
incomplete dominance
How many phenotypically different types of offspring are possible in a dihybrid cross between two heterozygous individuals?
In a dihybrid cross between two heterozygous individuals, there are 16 phenotypically different types of offspring possible. This is because there are 2^4 = 16 possible combinations of alleles that can be inherited from the parental generation.
What is the phenotype of all four offspring's?
Generally, if the parents are heterozygous and one allele is dominant over the other there are only 2 phenotypes and 3 genotypes. Parents Aa can produce AA, Aa and aa offspring. If the heterozygous individuals have an intermediate phenotype, then three genotypes and 3 phenotypes are possible. If 2 traits are being studied using heterozygous parents AaBb then the possible Genotypes are AABB, AABb, AAbb, AaBB, AaBb, Aabb, aaBb, aaBB, aabb which is nine genotypes. But there are 4 phenotypes. AABB AABb AaBB AaBb are phenotypically the same. aaBb, aaBB are phenotypically the same. Aabb, AAbb are phenotypically the same. aabb
How many phenotypes can come from a heterozygous parent and a homozygous recessive parent?
Two types: A heterozygous parent (Aa) and a homoygous recessive parent (aa) can produce phenotypically dominate and phenotpically recessive offspring (with 50% genotypes Aa and the other 50% aa). If the genes are co-dominate then the offspring can have blended traits and recessive traits phenotypically.
What phenotype frequency in a population changes after each generation. What would most likely be causing this?
In population genetics the frequency of individual alleles remain constant as long as alleles are neither selected for or against. Phenotypic frequency varies based on the relative frequency of the various dominant and recessive alleles in the population. Further, if selection is taking place phenotype will tend to change in the direction of the allele selected. If the population is small enough there is also the factor of genetic drift, which can change phenotype in one direction within a few generations. Populations are certainly being acted on and alleles selected whether they are obvious phenotypically...if these traits are linked with ones that are visually apparent the change will manifest phenotypically but the change occurs because of linkage to the selected trait as opposed to by selection for the phenotypically obvious one. Some traits give an advantage.
What is phenotypically xy on ultra sound?
Xy is a boy
What is A pattern of inheritance in which neither allele is phenotypically dominant to the other?
incomplete dominance
What is the task of the animal breeder?
to produce the animal that is both phenotypically and genotypically demanded by the customer.
Who generally inherits sex-linked traits?
In humans there is a higher incidence of male children who phenotypically diplay a sex-linked trait. The inheritence level in females is about equal to that of the males but, because they have two X chromosomes they carry it genotypically but not phenotypically.
What is incomplete penetrance?
Referring to the presence of a gene that is not phenotypically expressed in all members of a family with the gene.
The evolutionary history of a species is it's?
Phenotypically expressed and influenced Genotype: in other words, it's appearance.
How many phenotypically different types of offspring are possible in a dihybrid cross between two heterozygous individuals?
In a dihybrid cross between two heterozygous individuals, there are 16 phenotypically different types of offspring possible. This is because there are 2^4 = 16 possible combinations of alleles that can be inherited from the parental generation.
What is the phenotype of all four offspring's?
Generally, if the parents are heterozygous and one allele is dominant over the other there are only 2 phenotypes and 3 genotypes. Parents Aa can produce AA, Aa and aa offspring. If the heterozygous individuals have an intermediate phenotype, then three genotypes and 3 phenotypes are possible. If 2 traits are being studied using heterozygous parents AaBb then the possible Genotypes are AABB, AABb, AAbb, AaBB, AaBb, Aabb, aaBb, aaBB, aabb which is nine genotypes. But there are 4 phenotypes. AABB AABb AaBB AaBb are phenotypically the same. aaBb, aaBB are phenotypically the same. Aabb, AAbb are phenotypically the same. aabb
What types of alleles are expressed only if 2 identical copies exist on the homologs of the offspring?
Two copies of the recessive allele are the only way a recessive trait is expressed phenotypically.
How many phenotypes can come from a heterozygous parent and a homozygous recessive parent?
Two types: A heterozygous parent (Aa) and a homoygous recessive parent (aa) can produce phenotypically dominate and phenotpically recessive offspring (with 50% genotypes Aa and the other 50% aa). If the genes are co-dominate then the offspring can have blended traits and recessive traits phenotypically.
What is meant by dominance?
Complete dominance means that the dominant allele completely masks the effects of the recessive allele. The only way a recessive allele can be exhibited phenotypically is if the organism is homozygous recessive for that allele.
What is hidden in the heterozyotes?
Heterozygotes have two different alleles for a particular gene, where one allele is dominant and the other is recessive. The recessive allele is "hidden" in heterozygotes because it is not expressed phenotypically but can be passed on to offspring.
