Question

In: Biology

Gregor Mendel described allelic relationships as either dominant or recessive, and assumed that alleles and genes...

Gregor Mendel described allelic relationships as either dominant or recessive, and assumed that alleles and genes pairs are segregating independently during meiosis. What are the exceptions to those two laws of Mendelian genetics

Solutions

Expert Solution

Exception of law of dominance:

  • Incomplete dominance

    In incomplete dominance when a red snapdragon flowered plant is crossed with a white flowered plant an intermediate phenotype appears in the F1 hybrid instead of a parental phenotype.

  • Codominance

    Unlike dominance in codominance when a A (IAIAIAIA) blood group individual mates with B (IBIBIBIB) blood group individual the offsprings have blood group AB (IAIBIAIB) instead of A or B.

Exception of law of segregation:

  • Nondysjunction

    During meiosis homologous chromosomes/sister chromatids and hence genes may move to a common gamete violating law of segregation.

    Exception of law of independent assortment:

  • Linkage

    When genes are present on the same chromosome they tend to remain together and enter into the same gamete. This is the reason behind deviation of dihybrid test cross ratio from 1:1:1:1 and occurrence of parental combination in high frequencies.

gladiator answered 1 year ago
Next > < Previous

Related Solutions

Gregor Mendel established the concept of dominant and recessive genes and characteristics. According to Mendel’s law...
Gregor Mendel established the concept of dominant and recessive genes and characteristics. According to Mendel’s law when crossing two inbred lines, 75% of the offspring should show dominant and 25% recessive characteristics. In his 19th century work studying inheritance of seed form in peas, Mendel observed 7,324 individuals, 5,474 of which had dominant characteristics. a. Does this support or contradict Mendel’s law? Explain. b. If the observation would be 5,566 (out of 7,324), would it be likely that his conjecture...
Genetics: A geneticist is studying two genes. Each gene can be either dominant or recessive. A...
Genetics: A geneticist is studying two genes. Each gene can be either dominant or recessive. A sample of 100 individuals is categorized as follows. Write your answer as a fraction or a decimal, rounded to four decimal places. Gene 2 Dominant Recessive Gene 1 Dominant 57 20 Recessive 14 9 Send data to Excel (a) What is the probability that in a randomly sampled individual, gene 1 is dominant? (b) What is the probability that in a randomly sampled individual,...
A geneticist is studying two genes. Each gene can be either dominant or recessive. A sample...
A geneticist is studying two genes. Each gene can be either dominant or recessive. A sample of 100 individuals is categorized as follows. Write your answer as a fraction or a decimal, rounded to four decimal places. Gene 2.   Dominant(gene 2) Recessive(gene 2) Dominant gene1 53 27 recessive gene 1 17 3 Gene 1 (a) What is the probability that in a randomly sampled individual, gene 1 is recessive? (b) What is the probability that in a randomly sampled individual,...
A geneticist is studying two genes. Each gene can be either dominant or recessive. A sample...
A geneticist is studying two genes. Each gene can be either dominant or recessive. A sample of 100 individuals is categorized as follows. Write your answer as a fraction or a decimal, rounded to four decimal places. Gene 2.   Dominant(gene 2) Recessive(gene 2) Dominant gene1 53 27 recessive gene 1 17 3 Gene 1 (a) What is the probability that in a randomly sampled individual, gene 1 is recessive? (b) What is the probability that in a randomly sampled individual,...
What is the difference between dominant and recessive genes
What is the difference between dominant and recessive genes
Use this information for the two questions below: A and a are dominant and recessive alleles,...
Use this information for the two questions below: A and a are dominant and recessive alleles, respectively, of the same gene pair. 14) Which genotype(s) would result in an individual with the dominant phenotype? A) Aa and aa B) only AA C) only Aa D) AA and Aa E) AA and aa 15) Which genotype(s) would result in an individual with the recessive phenotype? A) AA only B) Aa only C) AA or aa D) Aa or aa E) aa...
Curly wing (CY) shape and stubble bristles (SB) are both recessive lethal alleles (i.e. dominant in...
Curly wing (CY) shape and stubble bristles (SB) are both recessive lethal alleles (i.e. dominant in terms of wing shape/bristles phenotype, but recessive for lethality). What would be the result (F1 phenotypic ratios) of a cross between two curly winged, stubble bristle flies? To develop a hypothesis to predict the phenotypic ratio for the F1 generation consider the following: What are the genotypes of the parents? _________________ What phenotypic ratio would you predict for the offspring of a cross between...
what do you know about the basics of genetics (Punnet Square, Dominant and recessive alleles)? Please...
what do you know about the basics of genetics (Punnet Square, Dominant and recessive alleles)? Please explain to me every single step in detail because I don't understand. Thank you!
How are traits inherited? 1. Dominant/recessive (Mendelian) 2. Incomplete Dominance 3. Codominance 4. Multiple Alleles (ABO...
How are traits inherited? 1. Dominant/recessive (Mendelian) 2. Incomplete Dominance 3. Codominance 4. Multiple Alleles (ABO blood group) 5. Multiple Genes (including Epistasis)
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT