In a genetic system of complete dominance, a recessive allele is expressed Select one: A. whenever it is present. B. only when it occurs on an autosome. C. only in the homozygous condition. D. only in the heterozygous condition.
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In a genetic system of complete dominance, a recessive allele is expressed
whenever it is present.
only when it occurs on an autosome.
only in the homozygous condition.
only in the heterozygous condition.
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- ch of the following best describes why males cannot be carriers of sex-linked traits? A. Males cannot be carriers because their Y chromosome makes them immune to sex-linked traits B. This is incorrect, males can be carriers of sex-linked traits O C. Males cannot be carriers because they only inherit one X chromosome, either having the trait or not O D. Males cannot be carriers because their mothers pass on an X chromosome without the sex-linked traitNLFN3, a gene in the X chromosome has been linked to Autism spectrum disorder ASD. Research has shown that the mutation R451C (represented by the allele X+) is recessive and causes ASD. Ear lobes in humans are coded by a single gene which displays simple dominance. E results in free earlobes, and e corresponds to attached earlobes. What is the probability of having a female offspring with ASD symptoms and attached earlobes from X+Y Ee and X+X ee parents? 25% O 100% 0% O 75% O 12.5% O 50%.Certain forms of human color blindness are inherited as X-linkedrecessive traits. Hemizygous males are color-blind, but heterozygous females are not. However, heterozygous females sometimeshave partial color blindness.A. Discuss why heterozygous females may have partial color blindness.B. Doctors identified an unusual case in which a heterozygousfemale was color-blind in her right eye but had normal colorvision in her left eye. Explain how this might have occurred.
- Which of the following is not true of sex limited traits? A they are determind by genes on the autosomes. B they are expressed in only one sex (mal or female). C they are carrid on the X chromsome. D they often result in sexual demorphism (very different physical appearance in male and female animals).Many inherited disorders in humans are controlled by a single allele with two genes Select one: a. False b. TrueIn humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Brie, can roll her tongue, but their son, Michael, cannot. Imagine, for a moment, that the mother and father separate, and the mother decides to If her second husband is homozygous dominant for the tongue-rolling gene, what remarry. would be the genotypic ratio of their offspring (i.e., the F1 generation)? a. 1 RR: 2 Rr : 1 rr b. 2 RR: 2 rr c. 2 RR: 2 Rr d. 2 RR :1 Rr :1 rr e. None of the above QUESTION 71 Characteristics (or traits) of an organism, such as those described in the examples above, are said to be heritable. In this context, the term "heritable" means... a. Able to induce production of hair in various species b. Traits that are most frequently seen within a given population early in development c. The ability for traits to be passed down from parent to offspring d. Traits that are only present when both…
- Why are sex-linked traits more common in males than in females? Select one: a. All alleles on the Y chromosome are recessive O b. Genes on the Y chromosome activate recessive genes on the X chromosome O c. Females never express recessive alleles on the X chromosome O d. A recessive allele on the X chromosome will always produce the trait in a male O e. All alleles on the X chromosome are dominant z/attempt.php?attempt=1173673&cmid=3837312&page=6#In genetic maternal effect, the phenotype of the individual is determined by which of these statements? A. The sex of the parent who transmits the gene B. The nuclear genotype of the maternal parent C. The sex of the individual with only one sex able to express the phenotype D. Cytoplasmic genes usually located in the mitochondria E. A combination of environmental factors and the genotype of the individualThe mode of inheritance of the auricular hypertrichous trait in the Brown family is clearly an instance of: Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. b d recessive inheritance with the females being carriers. dominant inheritance with the males being carriers. X-linked inheritance, which is being expressed in the males since they only have one X chromosome. Y-linked inheritance, which can never be passed on to females.
- In certain species of flies, eye color is controlled by sim-·ple dominance by a single pair of alleles. A red-eyed fly was crossed with a white-eyed fly, both of whose parents had white eyes. All of their offspring (both female and male) had red eyes.a. Which is dominant, the allele for red eyesor the allele for white eyes?b. What is the genotype of the white-eyed parents?c. If the white-eyed parent was mated with one of the red-eyed offspring, what phenotypic ratio wouldyou expect regarding eye color?When one examines the pattern of inheritance of a trait and finds that it is transmitted from fathers to sons to grandsons (never appearing in the females genotype) what is the conclusion about the inheritance pattern? a. Sex linked b. Sex limited С. Sex related d. X linked e. Sex influenced Red-Green color blindness a. Has its genetic determination on the x chromosome b. Affects more males than females С. Is influenced by somatic sex differentiation d. A and b e. All of theseThere are several forms of allelic genes interaction. At one of the forms a homozygous and a heterozygous organisms have the same phenotype. Which of the below mentioned forms of gene interaction can it be? Select one: a. Complete dominance c. Incomplete dominance d. Complementarity e. Codominance O b. Overdominance