In the pedigree below, male II-1 has Klinefelter syndrome, which is the result of an XXY karyotype. On the X chromosome, a gene called G6PD has two codominant alleles, G6PDA and G6PDB. In this pedigree, A, B, and AB refer to the phenotypes associated with the alleles of this gene. (Note: In this family, no individuals have the AB version of the phenotype.) B A

Q: In the fruit fly Drosophila melanogaster, a recessive condition called eyeless (ey) significantly…

A: First draw all the possible gametes for both the gametes. All gametes means all, including the…

Q: Familial Down syndrome is similar to primary Down syndrome in that it is caused by trisomy 21.…

A: Two normal copies of 14, two normal copies of 21: A.Two normal copies of 21, one normal copy of 14:…

Q: X-linked ichthyosis is an X-linked recessive trait that manifests in part as dry, scaly skin…

A: If one allele is missing it is hemizygous. Heterozygous is the presence of two different alleles at…

Q: In fruit flies, the autosomal recessive mutation pr causes brown eyes whereas the cn mutation causes…

A: A genetic characteristic or disease can be handed down from one parent to the next through autosomal…

Q: The following pedigree shows the inheritance of a human disorder. Affected individuals are shown…

A: A pedigree helps us to determine the inheritance of a trait across generations in a family.

Q: Brachydactyly type D is human autosomal dominant condition in which the thumbs are abnormally short…

A: Brachydactyly type D is a genetic abnormality, which occurs due to a dominant gene mutation in the…

Q: In guinea pigs, the allele for black fur (B) is dominant over the allele for brown (b) fur. A black…

A: The black fur allele B is dominant and brown fur allele b is recessive in guinea pigs. When a black…

Q: Consider a couple: a woman who is homozygous for a recessive mutation that causes X-linked…

A: The topic at hand revolves around the inheritance patterns of X-linked colorblindness within a…

Q: For the following chromosome complements, what is the phenotypic sex of a person who has Q. XO with…

A: The male sex-determining gene in human is termed as the sex determining region Y (SRY) gene.…

Q: In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are…

A: If two genes are located on the same chromosome then they are known as linked genes. In this…

Q: In the fruit fly Drosophila melanogaster, the trait of black body is due to a gene on chromosome 2…

A: To determine the recombination frequency and genetic map distance between the two genes, we need to…

Q: In beetles, an X-linked gene determines body size, with normal size (M)completely dominant to…

A: A genetic cross is an experimental breeding process performed to understand the patterns of…

Q: Imagine a germ cell for an animal that is 2n=4. Gene A and B are found on chromosome one, and the…

A: Meiosis is the cell division process that is responsible for the production of four haploid (n)…

Q: Two different female Drosophila were isolated, each heterozygous for the autosomally linked genes…

A: Crossing over refers to the exchange of genetic material in the germ line. During meiosis, the…

Q: Anhidrotic dysplasia (lack of sweat glands) is caused by loss-of-function of an X-linked gene. It is…

A: The female can be mosaic in nature. Because of presence of two X chromosomes. The one X chromosomes…

Q: In the haploid yeast Saccharomyces cerevisiae, the twomating types are known as MATa and MATα. You…

A: Saccharomyces cerevisiae refers to a species of yeast used in brewing, baking, and winemaking…

Q: boy with Klinefelter syndrome (47,XXY) is born to a mother who  is  phenotypically  normal  and  a…

A: Klinefelter syndrome is a rare disorder that is caused in males alone. It is due to the presence of…

Q: The following pedigree shows the inheritance of a disease due to a completely penetrant sex-linked…

A: Sexual intercourse refers to genetic patterns that are specific to the gender in which the genetic…

Q: A phenotypically abnormal individual has a phenotypically normalfather with an inversion on one copy…

A:

Q: The Klinefelter syndrome (disomy of the X chromosome in males) is a genetic disease caused by…

A: The normal humans contain 46 chromosomes. Between these 46 chromosomes, 44 are autosomes and 2 are…

Q: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

Q: The orange coat color allele in cats is located on the X chromosome and is one of two genes…

A: The two variants of coat color found in cats are orange and black. The alleles responsible for these…

Q: The gene that controls the Duffy blood type is D (affected D is dominant to d) and the gene that…

A: D allele encodes duffy blood type and it is dominant over d allele. dd encodes wild type.  L allele…

Q: Produce a Punnett square to illustrate the dihybrid cross described below: There are two common…

A: A trait is a characteristic feature that is unique to specific individual. It is represented by…

Q: In humans, color vision depends on genes encoding three pigments. The R (red pigment) and G (green…

A: The inheritance of color vision in humans depends upon three main genes that code for three…

Q: A recessive maternal effect mutant in zebrafish, called ichabod, results in embryos lacking heads…

A: Maternal effect in zebrafish is a situation where the phenotype of an organism is determined not…

Q: Color blindness in humans is controlled by an X-linked completely recessive allele (Xc), while…

A: Introduction :- Color blindness (colour vision deficit) is a condition in which a person's ability…

Q: Both hemophilia (h) and favism (gd) are inherited as X-linked recessive traits. Hemophilia is an…

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

Q: In humans, hemophilia is an X-linked recessive disorder that affects the gene for factor VIII…

A: Genetic disorders can be inherited either through recessive or dominant mutation. In case of a gene…

Q: A recessive allele causes Drosophila to have white eyes instead of wild-type eyes. This eye colour…

A: Inheritance is the process by which the properties/characteristics of one generation is passed on to…

Q: The mutant genes for vestigial wings and singed bristles are approximately 30 map units apart on…

A: Each gene has two alleles, one is a dominant allele and another is a recessive allele. If the mutant…

Q: In fruit flies, ken– is the mutant allele of a gene and ken+ is the wild-type allele. vg- is the…

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

Q: The following image shows a Robertsonian translocation between chromosomes 13 and 21. This has the…

A: Translocation is said to the condition when one piece of chromosome attaches to another bit of…

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.