4-Which of the following is controlled by multiple alleles A-Colour blindness B- Sickle cell anaemia C- Phenylketouria D- Blood group E- A and B F- B and C G-C and A 5.The phenonmenon of 'independent assortment' is based on: A- Monohybrid cross B- Dihybrid cross C- Trihybrid cross D- Back cross E-A and B F- C and A G - D and C
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- Multiple alleles refer to more than two alleles controlling a particular trait. A classic example is the ABO blood group system. Show more…
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Match the following terms to the appropriate statement: A. Simple Mendelian inheritance B. Incomplete dominance C. Codominance D. Polygenic inheritance E. Pleiotropy Both alleles are expressed at equal levels and if present together are expressed simultaneously. The presence of the dominant allele masks the effect of the recessive allele Need two copies of the dominant allele to show dominant phenotype and one copy of the allele shows half the phenotype Single gene affects multiple traits More than one gene affects one trait
Madhur L.
a) Heterozygous b) X sex-linked traits c) incomplete dominance d) standard dominance e) Recessive f) Epistasis g) Genotype h) Phenotype i) Dominant j) Homozygous k) Codominance A. Individuals with two of the same alleles for a trait are homozygous for that trait. B. In a Mendelian cross of standard dominance, all of the F1 individuals are heterozygous for the trait being studied. C. The phenotype is what an organism looks like. D. Individuals with different alleles for a single trait (regardless of the type of dominance for the trait) are classified as heterozygous. E. The genotype is the sum total of all alleles in an individual. F. In codominance, both alleles are fully expressed in the individual. G. Men cannot be carriers of X-linked traits.
Bryan V.
Two chromosomes that have the same genes but may have different alleles of those genes are said to be __________. A. Homologous. B. Sister chromatids. C. Identical. D. Duplicated. After DNA replication, a cell with damaged DNA or too many mutations does not enter mitosis because of __________. A. Crossover. B. The G2/M checkpoint. C. Trisomy. D. Cytokinesis. Which of the following is not an event of the mitotic phase? A. Formation of two new nuclei B. Chromosome segregation C. Mitotic spindle formation D. DNA replication Which of the following is a feature of cancer cells but not of normal cells? A. Growth factor dependence B. Contact inhibition C. Anchorage independence D. Normal chromosome number Which of the following statements regarding Down syndrome is false? A. The chance of Down syndrome decreases with the age of the mother. B. Trisomy 21 is the cause of Down syndrome. C. People with Down syndrome usually have a shorter life span than normal. D. Down syndrome is the most common serious birth defect in the United States. Homologous chromosomes A. have different alleles of different genes. B. have the same alleles of the same genes. C. have different alleles of the same genes. D. have the same alleles of different genes. Phenylketonuria (PKU) and oculocutaneous albinism (OCA or just albinism) are both recessive, monogenic diseases caused by A. A genetic deficiency in hormone signaling. B. Bacterial infection. C. Genetic overproduction of a toxic protein. D. A genetic loss of enzyme activity. Most genetic disorders are recessive, for example cystic fibrosis. A person born with cystic fibrosis likely had parents who were A. Slightly affected by the disease, showing some but not all of the symptoms. B. Subjected to some environmental toxin that caused the disease in their children. C. Not affected at all by the disease. D. Both affected by the disease. In cats short hair is dominant to long hair. You find a cat of unknown origin with short hair and to determine its genotype, you cross it to a cat with long hair. Of eight kittens born, four have short hair and four have long hair. What do you conclude about the genotype of your unknown cat. A. It's homozygous for the dominant allele. B. You can't draw any conclusion from the information given. C. It's homozygous for the recessive allele. D. It's heterozygous. Red-green colorblindness is an X-linked recessive disorder. A woman with red-green colorblindness has children with a man with normal vision. What is the probability of their having a colorblind son? A. 75% B. 50% C. 25% D. 100%
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