company that offers PGD terms an embryo “normal and healthy” if it has 46 chromosomes. Why is this statement misleading? , Two famous male actors had twins using a surrogate mother who carried two embryos that had been fertilized in vitro, one with one man’s sperm and the other with the other man’s sperm. In terms of genetics, how closely are the babies, a boy and a girl, related to each other if they have different fathers?

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: 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: Discuss and explain how a child inherits one copy of each gene from each parent. What processes…

A: Introduction  Due to the process of sexual reproduction, children inherit one copy of a gene from…

Q: In order to unravel the mysteries of human genetics scientists have studied the genetics of many…

A: "Scientifically testable" means that a hypothesis or question can be tested through empirical…

Q: Lois and Peter, who are each NOT trisomic for chromosome 21, are awaiting the birth of a 2nd child…

A: *Given that Lois and Peter are not trisomic for chromosome 21. * The probability of Down syndrome is…

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: Red-green color blindness in humans is due to an X- linked recessive gene. thin

A: Red-green color blindness is the most common variety of color deficiency in humans. It happens to…

Q: An expecting mother underwent a fetal blood test to determine if her unborn child has a genetic…

A: Introduction:-

Q: Why is an X chromosome needed for survival?

A: The sex chromosomes or allosomes are X and Y chromosomes which determine the biological sex of an…

Q: The X chromosome has a lot of traits for things besides the traits we consider female. It carries…

A: If a parent is XY then the parent can give only Y chromosome to its XY offspring as this offspring…

Q: Genetic Markers are___Portions of a ___whose inheritance patterns can be followed A) unidentifiable,…

A: Genetic markers can be described as DNA sequences whose positions on chromosomes are predefined.…

Q: Which of the following is least likely to produce genetic variation in the offspring of an…

A: Genetic variation is the changes in the genes of offspring from the parents. Meiotic cell division…

Q: In chickens, a key gene involved in sex determination has recently been identified. Called DMRT1, it…

A: The Sex-determination system determines the development of characteristics of sexual aspects in…

Q: The body cells of chickens have 78 chromosomes in their nuclei. (i) State the number of chromosomes…

A: The indirect process of cell division in which the chromosomes of parent cells divide once, but…

Q: Jeff's spermatogonium (precursor sperm cell before meiosis) looks like the cell on the left (only…

A: The improper separation of the sister chromatids or the homologous chromosomes during meiosis leads…

Q: The genes for the eye-color of fruit flies are located in their X chromosome, or X – linked. (R…

A: According to the question, we have to answer the following questions -  The genes for the eye color…

Q: Domesticated sheep cells have a total of 54 chromosomes (versus 46 chromosomes in human cells). (a)…

A: Chromosomes are the structures that carry DNA.

Q: Identical twins each carry the same genome, but over time, can develop different phenotypes. How can…

A: Identical twins are formed as a result of the fertilization of a single egg. The zygote later splits…

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: Draw a Punnett square for the dihybrid cross described below (it is the same story as given for…

A: X linked characters are those where the the gene in question is located on the X chromosome. Females…

Q: The chromosomes in the illustration below are found in a male betta fish and carry the gene for…

A: Mendel proposed the laws of inheritance based on the results of his hybridization experiments. He…

Q: The duck billed platypus is an unusual mammal. If you examine the sex chromosomes of a female…

A: The duck-billed platypus is an unusual, unique mammal, a member of the order Monotremata that is…

Q: Chorionic villus sampling is a procedure to determine if there are any abnormalities in chromosome…

A: Chorionic villus sampling is also used for the same purpose. Chorion is basically a membrane that…