- A Masking gene interaction
- B Epistasis
- C Supplementary gene interaction
- D Codominance
Genetics - Quiz
- A True
- B False
- C Neither true or false
- D Data Inadequate
- A Type of linkage
- B Masking or modifying gene effect
- C Upper portion of a chromosome
- D Group of genes
- A Allele with similar function
- B Allele with similar structure
- C Alleles with similar function and structure
- D Alleles with similar function and different structure
- A Law of dominance
- B Law of segregation
- C Law of independent assortment
- D Law of separation
- A Rat
- B Arabidopsis
- C Fly
- D Drosophila
- A True
- B False
- C Data Inadequate
- D None of the above
- A True
- B False
- C PTC tasting
- D Albinism
- A Duncan muscular dystrophy
- B Lesch-Nyhan syndrome
- C Mental retardation
- D Long protruding tongue
- A Cystic fibrosis
- B PTC tasting
- C A quantitative analysis of genetic variation
- D An analysis of polygenic traits
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Genetics - Quiz
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- A. Masking gene interaction
- B. Epistasis
- C. Supplementary gene interaction
- D. Codominance
Remarks:
Explanation:
Codominance is a type of inheritance where both alleles in a heterozygous individual are expressed equally. Unlike Mendelian inheritance, neither allele is dominant or recessive, and both traits are expressed in the offspring.
- A. True
- B. False
- C. Neither true or false
- D. Data Inadequate
Remarks:
Explanation:
When two true breeding varieties of white flowered plants are crossed, the resulting progeny may not have white flowers. In some cases, the resulting flowers may be a different color, indicating that there is a complementary gene interaction between the alleles controlling flower color. This means that both alleles contribute to the production of a pigment required for the final color of the flower.
- A. Type of linkage
- B. Masking or modifying gene effect
- C. Upper portion of a chromosome
- D. Group of genes
Remarks:
Explanation:
Epistasis is a type of gene interaction that involves the suppression of the effect of one gene by another non-allelic gene. It can result in the masking or modification of the expression of the gene. This type of interaction involves two pairs of alleles, and it can suppress both dominant or recessive alleles.
- A. Allele with similar function
- B. Allele with similar structure
- C. Alleles with similar function and structure
- D. Alleles with similar function and different structure
Remarks:
Explanation:
Pseudoalleles are two types of alleles that have similar functions but different structures. These genes are located in close proximity, and their similarity in function can lead to confusion in genetic analysis.
- A. Law of dominance
- B. Law of segregation
- C. Law of independent assortment
- D. Law of separation
Remarks:
Explanation:
Linkage of genes on chromosomes can result from the failure of independent assortment during the alignment of chromosomes in metaphase one. The other three laws do not directly result in linkage.
- A. Rat
- B. Arabidopsis
- C. Fly
- D. Drosophila
Remarks:
Explanation:
T.H. Morgan first studied linkage in Drosophila melanogaster, where genes on a chromosome are linked, creating a systemic gene. Morgan created the first genetic map of Drosophila melanogaster.
- A. True
- B. False
- C. Data Inadequate
- D. None of the above
Remarks:
Explanation:
In the case of sex linkage, reciprocal crosses do not yield identical results. Instead, they show a criss-cross inheritance pattern. This means that the answer to this question is B, false.
- A. True
- B. False
- C. PTC tasting
- D. Albinism
Remarks:
Explanation:
In the case of sex linkage, reciprocal crosses do not yield identical results. Instead, they show a criss-cross inheritance pattern. This means that the answer to this question is B, false.
- A. Duncan muscular dystrophy
- B. Lesch-Nyhan syndrome
- C. Mental retardation
- D. Long protruding tongue
Remarks:
Explanation:
Lesch-Nyhan syndrome is an X-linked disorder that causes excessive production of uric acid, known as congenital hyperuricemia. This disorder is caused by a defect in the HGPRT (Hypoxanthine Guanine Phosphoribosyl Transferase) gene. Therefore, the correct answer to this question is B.
- A. Cystic fibrosis
- B. PTC tasting
- C. A quantitative analysis of genetic variation
- D. An analysis of polygenic traits
Remarks:
Explanation:
Huntington's disease is an autosomal dominant disorder that is caused by an abnormal expansion of CAG trinucleotide repeats in the huntingtin gene. The normal range of CAG repeats in this gene is 10 to 35, but in individuals with Huntington's disease, the number of CAG repeats is greater than 40, leading to the production of a toxic protein that damages nerve cells in the brain.