In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the surviving offspring of a cross between a male that is heterozygous for the lethal allele and a normal female? a. 2:1 male to female b. 1:2 male to female c. 1:1 male to female d. 4:3 male to female e. 3:1 male to female

Q: A monohybrid cross is a mating where alleles of just one gene are tracked in the offspring.  A test…

A: A test cross helps to determine or check the zygosity of a particular individual. In this type of…

Q: You are studying pea plants.  You cross yellow seed plants with green seed plants and get all yellow…

A: It is given that yellow seed plants are crossed with green seed plants and all of the progeny showed…

Q: What is the difference between a monohybrid cross and a dihybrid cross?    A.  A monohybrid cross…

A: Sir Gregor Mendel was a priest and a teacher who did the famous hybridization experiment on garden…

Q: If a man with blood type AB marries a woman with blood type B whose father was type O, what…

A: These antigens are present on the plasma membrane of RBC (red blood cells). ABO blood grouping is…

Q: In a certain species of plant, the color purple is dominant to the color white. According to the…

A: A Punnett square is a tool used in genetics to predict the possible genotypes and phenotypes of…

Q: In Labrador Retrievers, a single gene controls whether an individual dog will be black or brown.…

A: Introduction  In a testcross, the genotype of an organism that expresses the dominant phenotype for…

Q: A couple both with blue eyes have a kid with brown eyes. In this case, the eye color is determined…

A:

Q: Fruit flies are very useful model organisms that have been used to study genetics. One mutant…

A: An eyeless fruit fly is represented by ey gene which is a recessive gene. Homozygous normal fly is…

Q: individuals in a given family have attached earlobes. Unattached earlobes are dominant over attached…

A: As unattached earlobes are dominant over attached, so attached earlobes have homozygous trait to…

Q: a diagram of a pedigree shows

A: Pedigree is the diagrammatic representation of individuals of a family for a particular trait.

Q: Color blindness is a recessive sex-linked trait on the X chromosome. A non-color blind heterozygous…

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

Q: Blue eyes and a straight hairline are both recessive alleles for two different genes. The dominant…

A: This is a dihybrid cross concerned with two characters at a time. Let the genotype for brown eyes be…

Q: The fur colour of Labrador dogs is determined by three alleles: black (FB), chocolate (F), and…

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

Q: If two genes on the same chromosome, A and B, are completely linked and no crossovers can occur…

A: When two genes are located on the different chromosomes or are far apart there are high chances of…

Q: If a Mendel's dihybrid cross between two double heterogotes (AaBb  x AaBb), assuming that the…

A: Dihybrid cross portrays a mating test between two life forms that are identically hybrid breed for…

Q: Red-green color blindness is an X-linked recessive trait in humans. Two people with color vision…

A: The red green color blindness trait is encoded by the gene present on X chromosome.

Q: If you crossed a heterozygous fruit fly with straight wings and red eyes to one with curly…

A: A phenotypic ratio helps to determine the likelihood of a trait and is most easily determined by…

Q: A is a dominant gene for normal pigment, and a is its recessive allele for albinism (and pink eyes).…

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

Q: A. 1/16

A: Dihybrid cross:  It is a process of breeding in which the cross takes place between the two…

Q: In mating between two individuals that are heterozygous for a recessive allele, what genotypic ratio…

A: When the alleles are expressed by suppressing or masking the effects of the another alleles, then…

Q: A scientist studying a species of algae, Gracilaria domingensis, discovered that its color is…

A: Alleles can be described as the different forms associated with particular gene. The formation of…

Q: Cystic fibrosis is a genetic disease caused by a recessive allele.  Two parents without the disease…

A: Cystic fibrosis is a hereditary condition which is caused by mutations in the cystic fibrosis…

Q: geny are obtaine

A:

Q: Will a cross breeding between a dog and an cat is possible? explain

A: Breeding is defined as sexual reproduction occurring between two organisms of the opposite sex of…

Q: Which observation led Thomas Morgan to realize that the gene for fruit fly eye color was located on…

A: The genes are present on chromosomes that segregate independently into different gametes. Each…

Q: This pedigree exhibits a maternal effect. What is the genotype of each individual?

A: Pedigree analysis is useful when identifyig any population when progeny data from several…

Q: A cross was made between a white male dog and two different black females. The first female gave…

A: Given that,  First cross is made between white male dog and black female. The result of this cross…

Q: A cross is made between a heterozygote, +++/abc, and a recessive homozygote, 450 + C 10 a + c 70 +bc…

A: Q. A cross is made between a heterozygote, +++/abc, and a recessive homozygote, abc/abc. Analysis of…

Q: In this pedigree, which parent-child pair allows you to reject the hypothesis of dominant X-linked…

A: Sex-linked dominant: In this type the gene or condition is dominant type which means expressed in…

Q: In fruit flies, the allele for red eyes (R) is dominant over the allele for white eyes (r). Imagine…

A: Dominant trait - red eyes Recessive trait - white eyes. The eye color gene is present on the X…

Q: Red-green colorblindness is a recessive trait that is located on the X chromosome. A woman named…

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

Q: T is tall white is short. Which individual genotype guarantees all tall offspring.

A: Genotype is defined as the genetic constituents present in an organism.

Q: Using the same information listed above for hair and eye color, (E = dominant brown eyes with e =…

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.