Albinism is a recessive trait in humans. A geneticist studies a series of families in which both parents are normal and at least one child has albinism. The geneticist reasons that both parents in these families must be heterozygotes and that albinism should appear in ¼ of the children of these families. To his surprise, the geneticist finds that the frequency of albinism among the children of these families is considerably greater than ¼. There is no evidence that normal pigmentation exhibits incomplete penetrance. Can you think of an explanation for the higher-than-expected frequency of albinism among these families?

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A: Ogla and Hank must be both heterozygous for the condition. That is why they are producing some…

Q: Albinism is inherited as a recessive trait in humans. If the parents are both  heterozygous for the…

A: Albinism is a rare genetically inherited trait that is only expressed in the phenotype of homozygous…

Q: Dwarfism is a recessive trait in Hereford cattle. A rancher in western Texas discovers that several…

A: In order to remove the recessive dwarfism the below-mentoned steps should be carried out: (a)…

Q: As discussed in the text, almost 5% of Caucasians carry a recessive gene for cystic fibrosis. Until…

A: Cystic fibrosis is an inherited disease which is characterized by formation of thick, sticky mucus…

Q: In humans, a very rare dominant allele that causes the little fingerto be crooked has a penetrance…

A: Penetrance is the probability of expression of a trait or gene. In a few cases, the phenotype is not…

Q: Using the pedigree chart below: Key Unaffected Affected Carrier Unknown 7 3 9 16 10 11 12 17 13 14…

A: Colour blindness can be described as a genetic disorder in which a person cannot differentiate…

Q: , why do we need to look at genetics at both organismal and the molecular level?

A: Dominance Dominance is defined as the phenomenon of masking the effect of another trait. The…

Q: For a recessive condition, two normal heterozygous individuals have children. What is the…

A: Suppose the allele affected in the condition is a.Normal:- AA Carrier:- Aa Diseased:- aa When Aa X…

Q: Silky feathers in fancy breeds of chickens are caused by a gene whose effect is recessive to that…

A: Genes are the functional units of heredity. It carries information from one generation to another.…

Q: The allele for hitchhiker’s thumb (h) is recessive to straight thumb (H). If a man and his wife are…

A: Hitchhiker’s thumb is known to be one of the mysteries in genetics, other than it is a very rare…

Q: Albinism is a recessive trait in humans.A geneticist studies a series of families in which both…

A: Exceptions to the Mendelian pattern of inheritance are many in number, which are important to study…

Q: ake the example of B-thalassemia, an autosomal recessive genetic disease that particularly affects…

A: A point mutation is a change in the single nucleotide pair of DNA.

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A:

Q: You have been tasked by a pharmaceutical company to generate a novel strain of Cannabis sativa for…

A: The union of male and female gametes and/or nuclei from the same haploid, diploid, or polyploid…

Q: In humans, the allele for brown eye color (B) is dominant to blue eye color (b). If two heterozygous…

A: SOME BASIC DEFINITIONS ALLELE - they occur in pairs and are responsible for the reprsentation of the…

Q: In a population of martians the hair color (H= purple or h=green) and eye-color (E=red or e=yellow)…

A: The genotype of the male’s father: HE/HEThe genotype of the male’s mother: he/heThe genotype of the…

Q: Jekyll-Hyde Afflicted Spider Curse Afflicted Jekyll-Hyde/Spider Curse Human 2. II 2 III 3.…

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A: It is given in the question that, Gene 1 - T = Producing large amount of Terpenes (dominant)   ;…

Q: I || 1 1 2 2 O 3 1 2 4 3

A: Pedigree analysis is a tool that is used to study the inheritance pattern of a trait in a family or…

Q: In the results that Mendel obtained, the violet colored flower was dominant to the white flower…

A: According to Mendel, various hereditary traits are controlled by factors and there is a pair of…

Q: Below is a pedigree of a rare human genetic disease in which stricken individuals are solid-colored.…

A: There are five modes of inheritance and they are X-linked dominant, X-linked recessive, autosomal…

Q: Assume that the length of a type of cucumber at maturity is controlled by two genes (A and B), each…

A: Given: The A and B alleles each add 3 inches of cucumber growth. The a and b alleles add only 1…

Q: Guinea pigs have coats that are either rough or smooth. Rough coats are dominant, so they are…

A: Homozygous Rough coated genotype = RRSmooth-coated (recessive) = rrThe smooth coat in Guniea pigs is…

Q: Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele have…

A: Dominant traits- S for sharp spines, N for long spines Recessive traits- s for dull spines, n for…

Q: In genetics, the dash symbol (–) is a “wild card” that stands for either the dominant allele or the…

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Q: A couple wants to have a child, but the mother has a brother that is affected by cystic fibrosis.…

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Q: In humans, potential or expecting parents can be tested for the presence of the allele for the…

A: Cystic fibrosis is a hereditary disease that affects the lungs and digestive system. The body…

Q: . A sex-linked recessive allele c produces a red–green color blindness in humans. A normal woman…

A: Since recessive allele is represented by (c), hence the phenotype of mentioned persons comes to be :…

Q: Mendelian multifactorial trait and a polygenic multifactorial trait

A: multifactorial traits are the phenotypes that are influenced by environment other than multiple…

Q: A sex-linked recessive allele rg causes a red-green colorblindness in humans. A normal woman whose…

A: Mostly the sex-linked diseases are X-linked ( unless stated otherwise). These alleles are found only…

Q: Assume that the length of a type of cucumber at maturity is controlled by two genes (A and B), each…

A: 1/8-10" , 3/8-8" , 3/8-6" , 1/8-4"

Q: In humans, alkaptonuria is a metabolic disorder in which affected persons produce black urine.…

A: Since there are multiple questions in this particular question, I will answer the first three…

Q: Below is a pedigree chart of a certain family with a genetic disorder. Shaded individuals show…

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Q: mammals, albinism is caused by an autosomal allele that interferes with skin pigment. Early one…

A: Albinism is an autosomal recessive trait. Normal = AA, Aa Albino = aa

Q: In humans, a simple explanation of hair texture suggests that it is controlled by two alleles. One…

A: Phenotypic characteristics of living organisms depend on the genotype of the organisms. Genes are…

Q: Are Mendel’s principles of segregation and independent assortment even relevant today in the age of…

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

Q: The characteristic of albinism (lack of pigment in skin and hair), can be caused by a single gene.…

A: Albinism is a genetic condition where people are born without the usual pigment (colour) in their…

Q: In a hypothetical situation, brachydactyly is caused by a recessive allele (b). If a woman who is…

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Q: Peas heterozygous for three independently assorting genes were intercrossed. (a) What proportion of…

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Q: Skin color is one of the traits in a human which is determined by polygenic inheritance system…

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Q: When Mendel did his experiments, it was the case that the genes for each trait were on separate…

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Q: Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color…

A: The X linked recessive phenotype is usually found more frequently in males than in the females .…

Q: Joe has a white cat named Sam. When Joe crosses Sam with a black cat, he obtains one-half white…

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Q: a) 50% homozygous dominant, 50% heterozygous

A: Answer:(A) 50% homozygous dominant, 50%heterozygous

Q: If the allele for brown hair is represented as “B” , it would mean that. A- the gene for brown hair…

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Q: Francis Galton, a geneticist of the pre-Mendelian era, devised the principle that half of our…

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Q: In humans, the gene for albinism (a) is recessive to the gene for normal skin pigmentation (A).…

A: An allele is a variant form a gene and is present in two forms: dominant and recessive. The dominant…

Q: Albinism is a recessive trait in humans . A geneticist studies a series of families in which both…

A: The diseases which are linked to the gene’s mutations are inherited.

Q: Part A) You cross a fly with straight wings with a fly with curved wings to produce the F1…

A: The alleles are the alternative forms of a gene that are located on the same locus of a homologous…

Q: This problem illustrates why classical geneticists in the days before DNA analysis usually needed to…

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.