An expecting mother underwent a fetal blood test to determine if her unborn child has a genetic disorder. The results from the test indicated that the fetus has 3 chromosomes 21. No other individual within this family has this genetic anomality. Explain how this happened

Q: Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one…

A: Down's syndrome occurs due to an error at the time of gamete formation. As a result the gametes may…

Q: The picture below represents a G1 cell from a newly discovered species that uses the X/Y sex…

A: The cell is in G1 phase and hence it undergoes the S phase to duplicate the DNA. Thus, homologous…

Q: A carrier is someone who carries a recessive allele in their genotype but does not display the…

A: In red-green colour blindness, deficiency of red-green cones occurs due to which person is unable to…

Q: Your friend is convinced his calico cat is male. He takes the cat to the vet. Sure enough the cat is…

A: A calico cat is a homegrown cat of any variety with a tri-variety coat. The calico cat is generally…

Q: Hemophilia is a X-linked/sex linked recessive trait in humans. The dominant allele (H) causes normal…

A: Himophilia is the disorder related to blood clotting. it is sex linked recessive disorder. So only…

Q: estions below all refer to the following pedigree. The locus for allele D/d determines how cilia on…

A: It is evident that the trait is not sex-linked because:-   In the case of Y-linked disorders, only…

Q: Sickle-cell disease is an inherited chronic blood disease caused by an autosomal recessive allele.…

A: Sickle cell anemia is an inherited red blood cell disorder in which the body's supply of healthy red…

Q: 1 2 3 4 5 i、月 6 8 9 10 11 12 13 14 15 16 17 18 19 20 Y 21 22

A: Karyotyping is the process by which photographs of chromosomes are taken in order to determine the…

Q: A cross was performed between a female curly winged fly and a normal (straight) winged male fly.…

A: As per the question, a cross was performed between a female curly winged fly and a male straight…

Q: The questions below all refer to the following pedigree. The locus for allele D/d determines how…

A:

Q: which genetic disorder matches below descriptions. extra 21st chromosome attaches to chromosome 14.…

A: Genetic disorder is defined as the disease caused by the abnormality in the genome of an organism.…

Q: Mr. and Mrs. Smith, both 40 years of age, are healthy with no knowngenetic conditions. Their newborn…

A: Down syndrome is defined as the condition in which an individual contains an extra chromosome. In…

Q: %3D 18 2> 22

A: A karyotype is the collection of an individual's chromosomes and their appearance under a light…

Q: milar pedigree. One of their daughters is colorblind. Give the genotypes of this nd paternal…

A: Colourbrindness is common hereditary disease. These diseases passed from parents. Mostly…

Q: Nail-patella syndrome gene is 10 map units from the I gene that determines the ABO blood type on…

A: Genes are the basic unit of hereditary. When two genes are present in the same chromosome, it is…

Q: Mrs. Dee (40 years old) and her husband have an amniocentesis for advanced maternal age. They…

A: The amniocentesis is performed for the genetical analysis of the fetus. It helps in the early…

Q: In a sample of 1000 patients with Down syndrome, a geneticist discovers that 95% of them are…

A: Trisomy is a kind of polysomy in which three instances of a particular chromosome occurs. Generally…

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: A form of hemophilia is caused by a sex-linked (X-linked) recessive gene. A phenotypically normal…

A: 50 percent chances.

Q: karyotype is an important clinical method for diagnosing genetic disorders. Explain why it is useful…

A: A karyotype can be defined as a photograph of total chromosomes in a human body. It can be also said…

Q: Explain how an individual can have Down's Syndrome, and a karyotype that reveals 46 chromosomes.…

A: A genetic disorder is a condition that is caused in whole or in part by a deviation from the…

Q: How many different types of gametes can be formed (see attached) and explain the calculation method?…

A: Genes are hereditary units, that control specific traits, and exist in two versions which are…

Q: During the pathoanatomic inspection of a baby-boy's dead body the following abnormalities:…

A: Chromosomal disorder are the abnormalities that arises due to alterations in chromosome arrangement…

Q: A couple is planning to have three children. What is the probability of having all boys? *

A:

Q: A woman with no phenotype is known to have a 14:21 translocation. Please answer questions 1 and 2.…

A: Between two acrocentric chromosomes where the centromere is at one end of the…

Q: If the mutation occurred in Jonathan's somatic cells when he was in his 30's, what type of alleles…

A: A neurodegenerative condition that is primarily inherited is Huntington's disease (HD), also known…

Q: (Lecture 13 Study Guide, Question #10) Genetic traits on the X-chromosome are called X-linked. Some…

A: Since, father is with fragile X syndrome and mother is normal, hence Genotype of father is XFY and…

Q: A women is heterozygous, Aa, for classic albinism and this gene maps to chromosome 11, and is a…

A: Oogenesis is the process of formation of female gametes called ovum or egg. The development of eggs…

Q: B A In the image above, the tissue found at letter B is; Нaploid Diploid Neither

A: The above image belongs to the ferns. It is the prothallus of the fern developed from spores.

Q: State who the genetic parents are and who the gestational mother is in each of the following cases:…

A: Introduction:- ART (assisted reproductive technologies)are used to give a chance to conceive a child…

Q: A 16-year-old girl appealed to the genetic consultation. She complains about menstruation absence.…

A: Introduction There are various genetic disorders that develop due to anomalies in sex chromosomes.…

Q: Assuming sexual reproduction and that no mutations have occurred. Please draw one possible genotype…

A: Genotype It is a description of our DNA's pair of alleles. The genotype of an offspring is…

Q: An STR on chromosome 9 is immediately adjacent to a gene involved in a dominant blood disorder (only…

A: Short Tandem repeats (STR): This are short repeated DNA sequences in a human body. This accounts for…

Q: An individual comes into your genetics clinic to be tested for any anomalies. When looking at their…

A: Given: An individual come to your genetics clinic to be tested for any anomalies.When looking at…

Q: 7. Figure 3 shows the karyotypes of two individuals suffering from a genetic disorder. 6. 10 11 10…

A: Answer- Genetic disorder can be of two different types that is- DNA mutation Chromosomal disorder…

Q: You are an allele on a single uncondensed chromosome in a Yellow fever-carrying mosquito (Aedes…

A: The somatic cells follow the mitotic process for division and the reproductive cells or gametes are…

Q: Why does a single X chromosome cause infertility and other abnormalities in Turner Syndrome…

A: Turner syndrome (TS) is a genetic disorder that mostly affects females. The clinical features of…

Q: If a father has Marfan syndrome, but the mother does not, and he passes the disease down to only…

A: Answer :- Marfan syndrome is a rare genetic disorder characterized by a variety of symptoms,…

Q: Hemophilia in humans is due to an X-chromosome mutation. What will be the result of mating a…

A: Introduction  Hemophilia is a genetic disorder that affects the blood's ability to clot normally.…

Q: How many Y chromosomes are there in an individual with Klinefelter syndrome? 0 1 2 3 4 CHOOSE ONE

A: Chromosomal aneuploidy arises due to non-disjunction ( failure of segregation of chromosomes )…

Q: A 43-year-old (gravida 2, para 2) pregnant woman requests chorionic villus sampling (CVS) and a…

A: The correct answer is b. Klinefelter syndrome is a diagnosis for a boy with mild to moderate…

Q: The image shows a pair of homologous chromosomes from a single parent before gamete production. M1…

A: Genetic linkage is a study which shows us the  genes or alleles which are close to each other on a…

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.