Detached earlobes in humans are a result of the presence of a dominant allele. In a class of 30 students, 4 students have attached earlobes. How many of the students are likely homozygous dominant for the trait? 4, 12, or 14

In humans, there are three alleles for blood type: A, B, and O. A and B are codominant over O. A male with type AB blood and a female with type A blood have a child. The male’s parents both had type AB blood. The female’s mother had type A blood and her father had type B blood. What is the potential phenotype of the child? A. type A (25%), type B (25%), type AB (25%), type O (25%) B. type A (25%), type B (50%), type AB (25%) C. type A (25%), type B (25%), type AB (50%) D. type A (50%), type B (25%), type AB (25%)

A cleft (dimpled) chin (C=cleft chin, c=no cleft chin) is caused by dominant allele. Two parents have NO cleft on their chin, but the father has prominent chin and the mother has a less prominent chin(P=prominent chin, p=less prominent chin). A prominent chin is dominant. Their child has a prominent chin and a cleft chin, explain how this is possible GENETICALLY? How do genetic drift and geneflow cause evolution? Give an examples.

In a dihybrid cross of two bi-allelic Mendelian genes, A (two alleles – completely dominant A and recessive a), and B (two alleles – completely dominant B and recessive b), such that the parental generation comprises of pure-bred homozygotes (i.e. AABB with aabb), what are the expected genotype and phenotype ratios in the F1 and F2, if the F1 cross is (a) an intercross and if the F1 cross is (b) a testcross

The allele A is brown fur and the allele a is white fur. In a mating between a heterozygous male and a heterozygous female, what is probability that they will have an offspring with brown fur and what is the probability they will have an offspring with white fur?

For the polydactyly trait, P = polydactylous (having 6 fingers), p= normal (having 5 fingers). What is the probability (at each ,ating) that two parents who are both homozygous dominant for the trait will produce a 6 fingered offspring? 0% 25% 50% 75% 100%

Given that there is a trait determined by the alleles A and a, where A is dominant, i.e., the presence of A determines the phenotype.  Assume that two parents have four children, and assume that nothing is known about the parents.  One of the four children shows the recessive condition (so its genotype is aa) and the other three show the dominant trait (so their genotype is either Aa or AA).   What can we conclude about the parents? Group of answer choices - at least one parent shows the dominant trait - Both parents are heterozygous - Both parents have at least one recessive allele

In horses, two different genes affect the coat. One gene which codes for coat colour has 2 codominant alleles for Brown and White colour coat. The heterozygous form exhibits a tan colour. The second gene codes for presence of hair with hairy (dominant) and hairless (recessive). If the female has tan hairless coat and the male has brown colour and is heterozygous for haired coat, what are the probabilities of the different offsprings they may have?

PTC, or phenylthiocarbamide, is a chemical that, to humans, either tastes bitter or has no taste at all. The ability to taste the bitterness of PTC is controlled by a single gene that codes for a bitter taste receptor on the tongue. Tasters, or individuals that can taste the bit- terness of PTC, have at least one copy of the dominant allele, T. Nontasters, or individuals who cannot taste the bitterness of PTC, must have two copies of the recessive allele, t. The numbers of tasters and nontasters in the human population are shown in the table below. A B Phenotype с Tasters Select all that apply - There are 2 correct options. D Nontasters Total If the population is in Hardy-Weinberg equilibrium, which of the following identifies the correct genotype frequencies for the population? Number of Individuals 1,762 338 2,100 A total of 2.56 percent of the population are homozygous dominant. A total of 13.44 percent of the population are heterozygous. A total of 48 percent of the population are…

In mice, the presence of a dominant A allele results in the agouti pattern of fur color, whereas the aa homozygous recessive results in a solid color pattern. The presence of another dominant B allele results in black fur color, whereas the homozygous recessive bb results in brown fur color. The presence of a third dominant C allele is required for any color to be observed (brown or black), whereas the homozygous recessive cc results in lack of any color whatsoever (albino).  What is the phenotype of a mouse with the following genotype? Aa bb cc   albino Agouti color pattern and brown Solid color pattern and brown Agouti color pattern and black Solid color pattern and black