In some allele combinations, dominance does not exist.
did
If a cross between two organisms shows complete dominance, all individuals in the first generation (F1) will display the dominant trait. This indicates that the dominant allele is fully expressed, masking the recessive allele. To confirm complete dominance, further crosses involving the F1 generation can be conducted to observe the phenotypic ratio of the offspring.
codominance. In codominance, both alleles contribute to the phenotype and are fully expressed in the offspring. This results in a distinct phenotype that is a combination of the traits associated with each allele.
False. Blood type genes have two dominant alleles (A and B), and one recessive (O). When a person gets one A allele and one B allele, they then have the blood type AB. Both are expressed equally. In other genes, a dominant allele might not be completely dominant, allowing the recessive allele to be partially expressed.
This shows incomplete dominance, where neither allele is completely dominant over the other. In this case, the pink color is a blend of the red and white alleles, resulting in an intermediate phenotype.
did
NB, Nb
If a cross between two organisms shows complete dominance, all individuals in the first generation (F1) will display the dominant trait. This indicates that the dominant allele is fully expressed, masking the recessive allele. To confirm complete dominance, further crosses involving the F1 generation can be conducted to observe the phenotypic ratio of the offspring.
codominance. In codominance, both alleles contribute to the phenotype and are fully expressed in the offspring. This results in a distinct phenotype that is a combination of the traits associated with each allele.
False. Blood type genes have two dominant alleles (A and B), and one recessive (O). When a person gets one A allele and one B allele, they then have the blood type AB. Both are expressed equally. In other genes, a dominant allele might not be completely dominant, allowing the recessive allele to be partially expressed.
an allele present in all members of a population- APEX
This shows incomplete dominance, where neither allele is completely dominant over the other. In this case, the pink color is a blend of the red and white alleles, resulting in an intermediate phenotype.
Complete dominance is when the presence of one allele ensures that the trait of the other allele is not displayed. For example, if B codes for black fur and b codes for white fur, a rabbit with Bb will have black fur. This is because the B shows complete dominance over the b - meaning that black fur will result. If this was incomplete dominance, a rabbit with Bb would have a mix - so grey fur. If it was codominance, a rabbit with Bb would have black and white patches, dots or splotches.
the dominant allele is in all egg nuclei.
During meiosis, the possible allele combinations that could be formed depend on the number of alleles present for each gene. If the cell is diploid (2n), then there are 2^(n) possible combinations, where n is the number of alleles for each gene. For example, with two alleles (A and B) for a single gene, the possible combinations are: AB, Ab, aB, and ab.
A Punnett square is a diagram used to predict the possible genotypes of offspring in a genetic cross. It displays all possible combinations of alleles that parents can pass on to their offspring.
not really. that would be co-dominance. incomplete dominance is when a heterozygote genotype is expressed as intermediate between the two alleles. for example: if you cross a red snapdragon (RR) with a white snapdragon (WW) all the offspring will be RW which will code for a different color, such as pink.