Concept explainers
a.
To determine: The possible
Introduction: The human blood group is an example of codominance where the alleles for the two antigens A and B are equally dominant. It means that when the two antigens A and B are present, the blood group is AB whereas in the absence of both the antigens, the blood group is O.
b.
To determine: The genotype of the individuals with blood group O.
Introduction: The individuals with the blood group O lack the surface antigens for both the blood groups A and B. Therefore, the expression of type O blood group occurs when the individual inherits both the recessive alleles. It makes people with type O blood group to become universal donors.
Want to see the full answer?
Check out a sample textbook solutionChapter 3 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
- Mendel performs a cross using a true-breeding pea plant with round, yellow seeds and a true- breeding pea plant with green, wrinkled seeds. What is the probability that offspring will have green, round seeds? Calculate the probability for the F1 and F2 generations.arrow_forwardIn cats, the gene for calico (multicolored) cats is both sex-linked and codominant. Due to a phenomenon known as dosage compensation, females that receive a B and an R gene have black and orange splotches on white Males can only be black or orange, but never calico. a. What would a calico cat’s genotype be? b. Show the cross of a female calico cat with a black male. What percentage of the kittens will be black and male? c. What percentage of the kittens will be calico and male? d. What percentage of the kittens will be calico and female? e. Show the cross of a female black cat with a male orange cat. f. What percentage of the kittens will be calico and female? What color will all the male cats be?arrow_forwardMonohybrid Cross: 1) In dogs, wire hair (S) is dominant to smooth (s). a. In a cross between a homozygous wire-haired dog with a smooth haired dog what are the genotypes and phenotypes of the F1 generation? b. If a brother and sister from the F1 generation are crossed what is the expected ratio of wire-haired to smooth-haired dogs produced from this cross?arrow_forward
- Suppose a woman has four sons, and two are colorblind but have normal blood clotting and two have hemophilia but normal color vision. What is the probable genotype of the woman? b. Suppose this woman (later on) had a son with normal vision and normal blood clotting. How can this be explained?arrow_forwardIn certain species of flies, eye color is controlled by sim-·ple dominance by a single pair of alleles. A red-eyed fly was crossed with a white-eyed fly, both of whose parents had white eyes. All of their offspring (both female and male) had red eyes.a. Which is dominant, the allele for red eyesor the allele for white eyes?b. What is the genotype of the white-eyed parents?c. If the white-eyed parent was mated with one of the red-eyed offspring, what phenotypic ratio wouldyou expect regarding eye color?arrow_forwardRabbits may be classified as agouti, chinchilla, Himalayan, or albino according to coat color. A crossbetween CC^h x C^ch c produced 5 agouti, 3 chinchilla and 2 Himalayans. a. What are the phenotypes of the parent rabbits? b. What are the genotypes of the F1s? c. What mode of inheritance is exhibited? d. If the two F1 agouti genotypes will be crossed, what percentage of their offspring will have the same phenotype? e. What will be the genotypes of the rabbits in (d)?arrow_forward
- Rabbits may be classified as agouti, chinchilla, Himalayan, or albino according to coat color. A cross between CC h x C ch c produced 5 agouti, 3 chinchilla and 2 Himalayans. a. What are the phenotypes of the parent rabbits? Copy the genotypes then write the corresponding phenotype beside each. b. What are the genotypes of the F1s? c. What mode of inheritance is exhibited? d. If the two F1 agouti genotypes will be crossed, what percentage of theiroffspring will have the same phenotype? e. What will be the genotypes of the rabbits in (d)?arrow_forwardThe petal color of a species of flowers is inherited along Mendelian ratios. A cross of two plants with red flowers produces 1,068 plants with red flowers and 390 plants with yellow flowers. A. Propose a model to explain the inheritance of red and yellow flowers. B. Determine the probability of producing a plant with yellow flowers when a heterozygous plant with red flowers is crossed with a homozygous plant with yellow flowers. B I U 三 三 of 22 Answered tv MacBook Air 吕口 F3 D00 F4 # $ & 3 4 5 6 7 Q W E Yarrow_forward. In fruit flies (Drosophila melanogaster), the bn+ allele for normal dull red eyes is dominant to the bn allele that gives brown eyes. Another gene affects wing shape; for this gene, the ct+ allele for normal wings is dominant to the ct allele, which gives “cut” wings, with jagged edges. A fly with dull red eyes and normal wings was crossed with a fly that had dull red eyes and cut wings, and the following progeny were obtained: 16 dull red eyes, normal wings 14 dull red eyes, cut wings 5 brown eyes, normal wings 5 brown eyes, cut wings What were the genotypes of the parents?arrow_forward
- raccoons may have wide, medium-sized, or narrow bands around their tails. They may also havethe habit of washing all, or some of their food, or do not wash their food at all. a) assign genotypes to the phenotypes mentioned (see attached table) b. What mode of inheritance would most likely be exhibited by these traits if crosses were made? c. If two raccoons with medium-sized tail bands and have the habit of washing some of theirfoods will be crossed, what is the probability of having F1 raccoons with: c.1 wide tail bands that won’t wash any of their food? c.2 the same genotype as the parent raccoons? d. If a raccoon with a wide tail band that washes only some of its food is crossed with a raccoonwith a narrow tail band that doesn’t wash any food, what percentage of their offspring wouldbe medium-tailed and washes all its food? Show COMPLETE cross.arrow_forwardchoose only if its a or b no need to explain. 1.) In sex-linked inheritance, if a colour blind man mates with a heterozygous woman, what is the expected ratio of phenotypes among the offsprings? Question 6 options: a.) normal female : heterozygous female : normal male : colour-blind male (1 : 1 : 1 : 1) b.) normal female : normal male : colour-blind male (2 : 1 : 1) c.) normal female : heterozygous female : normal male ( 1 : 1 : 2) d.) heterozygous female: colour blind female: normal male: colour-blind male (1: 1: 1: 1) 2.) The human female has two X chromosomes. In which of the following ways will x-linked traits be inherited among humans? a.) from mother to daughter only b.) from mother to son only c.) from mother to both son and daughter d.) from mother neither to son, nor to daughterarrow_forwardch of the following best describes why males cannot be carriers of sex-linked traits? A. Males cannot be carriers because their Y chromosome makes them immune to sex-linked traits B. This is incorrect, males can be carriers of sex-linked traits O C. Males cannot be carriers because they only inherit one X chromosome, either having the trait or not O D. Males cannot be carriers because their mothers pass on an X chromosome without the sex-linked traitarrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage LearningBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax