Good Doc Q's

• An organism can be either homozygous or heterozygous for a trait in its phenotype.
• If two parents are heterozygous for A blood group, the probability that their child will have type O blood is ¼.
• The probability that individual III-1 is Ww is 2/4.
• The genotype of individual II-5 is Ww.
• If two parents are heterozygous for B blood trait, the probability of having a child with O blood type is ½.
• In a cross between Rr X rr, the probability that offspring will have the Rr genotype is ½.
• If both parents are carriers for the gene that causes sickle cell disease, the probability that their child will be carrier is ¼.
• An organism with the genotype AaBbCC can produce 16 different types of gametes.
• A DNA-based test for the allele of a particular gene can be used to screen all newborns of an at-risk population.
• An additive effect of two or more genes on a single phenotype is referred to as polygenic inheritance.
• The principle of independent assortment states that alleles separate during gamete formation.
• The probability of producing plants with white axial flowers among the F2 offspring of the cross is 1/4.
• Albinism is a recessive trait where an individual does not produce the pigment melanin.
• In the cross AaBbCc x AaBbCC, the probability of the offspring to have the genotype aabbCc is ¼.
• A male born with an attached earlobe has parents with genotype AA and aa.
• A single-character testcross yields offspring that all have the dominant phenotype, indicating that the parent with the dominant phenotype was heterozygous.
• If the expression of a gene at one locus alters the phenotypic expression of a gene at a second locus in a dihybrid cross (AaBb x AaBb), the offspring ratio will result in 1:3:1.
• A man and woman who both produce melanin have one child out of three who has albinism.
• A man who has type B blood and a woman who has type A blood could have children of phenotypes A or B, AB, or O.
• Human blood groups are governed by three alleles: IA, IB, and i.
• If a certain cross produced 50% aa and 50% another genotype, the parents are: Aa, aa.
• One gene must be responsible for these coat color in Labrador retrievers.
• The law of segregation can be explained by the segregation of homologous chromosomes during meiosis.
• The father’s phenotype is A negative or O negative.
• Hydrangeas plants of the same genotype are planted in a large flower garden.
• When plants with red flowers are crossed with plants with white flowers, 25% of the offspring will have pink flowers.
• Some hydrangea plants produce blue flowers and others pink flowers.
• A woman with type A positive blood has a daughter who is type O positive and a son who is type B negative.
• In snapdragons, heterozygotes for one gene have pink flowers, while homozygotes have red or white flowers.
• Many of the observable characters that vary in pea plant are controlled by single genes.
• The inheritance of the ABO blood system in humans, coat color in Labrador Retriever dog, skin color in humans, and flower color in snapdragons represents epistasis inheritance.
• It is possible to obtain large number of progeny from any given cross.
• Pea plants have an unusually long generation time.
• The F1 offspring of Mendel's classic pea-cross always looked like one of the two parental varieties because each allele is affected by phenotypic expression.
• The self-pollination (trihybrid cross) of this plant would generate 64 different possible combinations of allele in offspring A.
• A monohybrid cross involves one parent, while a dihybrid cross involves both parents.
• A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid only one.