Dimples are a dominant trait that follows a complete dominance inheritance pattern. If you cross a heterozygous Dd father and a homozygous dd mother, what is the predicted percentage of offspring who will have Dimples? 100% 50% 25% 0%
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- Zoe's parents were both heterozygous for the recessive cystic fibrosis allele. Zoe has cystic fibrosis. What is the chance that Zoe's future siblings will have cystic fibrosis? 25 percent 50% 100% 0%A WOMAN IS HETEROZYGOUS FOR A TRAIT CAUSED BY A DOMINANT ALLELE THAT SHOWS 75% PENETRANCE. HER PARTNER IS UNAFFECTED. WHAT IS THE PROBABILITY THAT, IF SHE HAS A CHILD, IT WILL BE AFFECTED? (HINT: WHAT'S THE CHANCE SHE WILL PASS THE ALLELE ON TO HER CHILD AND THAT THE CHILD WILL SHOW THE TRAIT?)A monohybrid cross between two pea plants producing yellow peas, resulting in an F1 phenotypic ratio of 3:1 (three yellow pea plants to one green pea plant) indicates what about the parental pea plants? one parental pea plant is homozygous dominant, and the other is homozygous recessive both parental pea plants are homozygous dominant one parental pea plant is homozygous dominant, and the other is heterozygous both parental pea plants are heterozygous one parental pea plant is homozygous recessive, and the other is heterozygous
- Incomplete dominance is characterized by a cross between homozygous dominant and recessive genes that will result in an intermediate trait assume the following sets of genes is a human being: BB – black-colored pupil HH – straight hair Bb – blue-colored pupil Hh – wavy hair hh – curly hair A husband and wife, BBHH x bbHh, want to know the probability of having a child with a blue-colored pupil and wavy hair. What will you tell them? O There is a ¼ chance that the offspring will have blue-colored pupils and wavy hair. O There is a ½ chance that the offspring will have blue-colored pupils and wavy hair. O There is no chance that the offspring will have blue-colored pupils and wavy hair. O Impossible to determine.In humans, curly hair is dominant to straight hair. A woman heterozygous for curly hair marries a man with straight hair and they have children. What is the probability that the first child will have curly hair? What is the probability that in a family of four children 3 will be curly and 1 will be straight haired? What is the probability that the first three children will be curly-haired girls and the next will be a straight haired boy?In cats, coat color is determined by allelic variation at a single autosomal locus, with black fur dominant to white fur. Two heterozygous black cats are mated. What would be the probability of the following combinations of offspring in a litter of eight kittens? The firstborn kitten with white fur, and among the remaining seven kittens, three with black fur and four with white fur.
- Given a cross between these two parents: BbCcDDEEFfGgHhJj x BbCcddEeFfGgHHjj where traits B, E, H, J exhibit Mendelian inheritance; C, and F exhibit incomplete dominance; D, and G exhibit co-dominance answer the following: How many possible gametes can the first individual produce? What proportion of the offspring will phenotypically resemble the first parent? What proportion of the offspring will genotypically resemble the second parent? How many phenotypes can be expected from the cross?Huntington's disease is characterized by a late onset of nerve degeneration that leads to death. The allele that causes the disease is dominant. Lucille is homozygous dominant for the disease and Joe is homozygous recessive. What is the probability that their children will have Huntington's disease? 0% 1/4 or 25% 2/4 or 50% 3/4 or 75% 4/4 or 100%Consider the following cross examining four gene in two parental lines: Parent 1: A/a; B/b; D/d; e/e Parent 2: a/a; b/b; d/d; E/e Assuming independent assortment for the four genes, what fraction of progeny will have the same genotype as that of parent 2? O 1/2 O 1/4 1/8 O 1/16
- n rats, black fur color is dominant to white fur color, and pointy ears are dominant to round ears. You cross a homozygous black, pointy eared rat to a homozygous white, round eared rat. You then Cross one of the F1 offspring to a homozygous white, round eared rat, and obtain the following progeny: 88 black, pointy eared rats; 92 white, round eared rats; 76 black, round eared rats; 81 white, pointy eared rats. Please perform a chi-square test of independence to determine if the genes for fur color and ear shape are linked, or assort independently.In cows, there is a "splotchy" phenotype that is splotches of brown and white. A true-breeding white cow (homozygous recessive) is bred to a true-breeding brown cow (homozygous dominant). In the resulting offspring, 75% have spots of brown and white and 25% are brown. The phenotype described displays what kind of relationship(s) between alleles? Incomplete penetrance Incomplete penetrance Variable expressivity Variable expressivity Incomplete dominance Incomplete dominance CodominanceIn chickens, the Leghorn variety has white feathers due to an autosomal dominant allele. Silkies have white feathers due to a recessive allele in a second (different) gene. If a true-breeding whiteLeghorn is crossed to a true-breeding white Silkie, what is theexpected phenotype of the F1 generation? If members of the F1generation are mated to each other, what is the expected phenotypic ratio of the F2 generation? Assume the chickens in the parental generation are homozygous for the white allele at one gene andhomozygous for the brown allele at the other gene. In subsequentgenerations, nonwhite birds will be brown.