Cat breeders are aware that kittens expressing the X-linked calico coat pattern and tortoiseshell pattern are almost invariably females. Why are they certain of this?

Q: In female mamals, X chromosome inactivation often leads to phenotypic mosaicism. Assume that black…

A: Coat color in animals is controlled by either autosomal or sex-linked genes. Coat color is a…

Q: Predict the potential effect of the Lyon hypothesis on the retina ofa human female heterozygous for…

A: The eye is the most important sensory organ in the organism. It is mainly responsible for vision. In…

Q: What sex ratio would you expect among the offspring of a cross between a normal mape mouse and a…

A: Sex ratio is defined as the ratio of males and females in the population. Generally in sexually…

Q: What are the expected phenotypic ratios in the F, generation? If one of the F, males is mated to an…

A: The cross is between red bar-eyed female and purple normal eyed male. The genotype of the female is…

Q: A male has a particular X-linked recessive genetic disorder. His partner is normal, but her father…

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

Q: A cross between a red-eyed  fruit-fly and a white-eyed  fruit-fly produced an F1with all bar-eyed…

A: Sexual dimorphism is seen in most animals and many plants; in other words, a person may be either…

Q: Could a woman with the X-linked color-blind trait have a son without colorblindness? Use a Punnett…

A: The mechanism of the transfer of genetic material from parent to an infant is the process of…

Q: Hypospadias, a birth defect in human males in which the urethra opens on the shaft instead of at the…

A: Urethra is a structure which carries both urine and sperm in male reproductive system and it opens…

Q: In dosage compensation, do males sometimes overcompensate or is it always Barr body X-chromosome…

A: Dosage compensation is the process by which the organisms equalizes their genetic expression between…

Q: Why is the development of individuals with Klinefelter's and Turner's syndromes relatively normal,…

A: This syndrome occur due to presence of an additional copy of X chromosomes resulting into karyotype…

Q: Explain how X-linked inheritance differs from inheritance ofautosomal traits.

A: X-linked inheritance There are two possibilities if it inherit in dominant and the recessive.…

Q: The pedigree below shows a pedigree for a completely penetrant X-linked trait caused by a recessive…

A: The Pedigree shows X linked recessive trait. In this type of inheritance pattern the mutation lies…

Q: The production of pink flowered plants from a cross between a red flowered plant and a white…

A: In monohybrid cross, pure breeding plants with dominant and recessive phenotypes are crossed.…

Q: In humans, hemophilia is an X-linked recessive gene and will only be expressed in females if  they…

A: Hemophilia is a X linked recessive disorder so which is inherited in homozygous condition. In rare…

Q: What would be the outcome of a cross between a heterozygous female and a male that carries two…

A: The IGF2 (insulin-like growth factor 2) gene gives instructions for the synthesis of igf2…

Q: The pedigree below shows the inheritance pattern of a rare X-linked allele for one family. The…

A: Pedigree is a family chart where genetic councillor put some symbol for easy description of a…

Q: Why do X-linked recessive conditions appear most commonlyin males?

A: The genes are hereditary units of an organism. The appearance of the characteristics are a resultant…

Q: What is the reason for the white feathers of F1 hens with the Cc Ii genotype?

A: When one allele or variation of a gene on a chromosome masks or overrides the effects of a different…

Q: In marsupials like the opposum or kangaroo, X inactivation selectively inactivates the paternal X…

A: Since we only answer up to 3 sub-parts, we’ll answer the first three. Please resubmit the question…

Q: Discuss the genetic determination of sex and the inheritance of X-linked genes in mammals.

A: Humans have 23 pairs of chromosomes in their body, among which 22 pairs are the somatic chromosomes,…

Q: The genotype of a dwarf mouse is Igf2 Igf2–. What is the genotype of its father who has normal body…

A: Knowing how features are passed down from parents to children requires incorporating knowledge of…

Q: The mutant FMR-1 allele that causes fragile X syndrome is considered to be X-linked dominant…

A: Fragile X syndrome is a genetic disorder. It causes various developmental disorders that include…

Q: Color blindness is a X-linked trait in human.  A cross was done and F1 showed half of the female and…

A: Colour blind inheritance is a kind of X linked recessive inheritance which means that usually males…

Q: Suppose a man with color blindness, an X-linked recessive trait, has children with a woman who is a…

A: The alleles are generally of dominant and recessive type and some other forms like codominant and…

Q: x linked trait and give me an example

A: A trait is a specific character of an organism. Different traits are the result of genes that are…

Q: An attached-X female fly, XX ¬Y (see the “Insights and Solutions” box), expresses the recessive…

A: Inheritance or heredity is passing-on one trait from the parents to the progeny by either asexual or…

Q: In cats, color of the fur is X-linked. Black hair is dominant (B), orange hair is recessive (b) and…

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

Q: X-linked disorders (like hemophilia) are more likely to affect people of one gender than the other.…

A: Haemophilia is one of the X-linked recessive hereditary genetic diseases, which occur when the gene…

Q: The inheritance in short wings in Drosophila fruit flies is an x-linked trait, recessive. Which…

A: X-linked recessive inheritance is caused when a mutation occurs in the X-chromosome therefore a male…

Q: What is the approximate percentage chance that individual V.2, shown in the pedigree diagrams above…

A: A recessive attribute is one that may be detected within the relationship between 2 variants of a…

Q: What is the link between a phosphate functional group, the cellular respiration and the X-linked…

A: A phosphate functional group is a simple phosphorus atom that is bound to four oxygen atoms.…

Q: Give the F1 genotypes of  GgXHXh    and      GgXhY

A: Genotype is the representation of genetic constitution in the form of allelic combinations.…

Q: Explain why X-linked recessive traits in humans are observed in more males than females.

A: As we know, males are hemizygous for X-connected genes  (they have just a single X chromosome), any…

Q: Why are there so few Y-linked traits in humans?

A: The study of genetic variations, heredity, and genes is called genetics.

Q: QUANTITATIVE Recall that hemophilia is an X-linked recessive disease. If a woman with hemophilia had…

A: Haemophilia is an X-linked recessive trait and shows transmission from a normal carrier female…

Q: .Certain forms of human color blindness are inherited as X-linkedrecessive traits. Hemizygous males…

A: Color blindness is defined as the inability of the person to distinguish between colors, especially…

Q: Describe how X-linked traits are inherited and explain how X-linked inheritance is different from…

A: Inheritance is the process by which the genetic information is passed on from the parent to child.

Q: When expressing X-linked recessive gene notation, how should the notation be written.  Should I use…

A: X-linked recessive inheritance is a type of inheritance in which a mutation in a gene on the X…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.