Concept explainers
The physical position of a gene on a chromosome is its _______ slightly different forms of a gene are called_________.
a. locus; alleles
b. locus; polygenic
c. chiasma; alleles
d. trait; hybrids
Introduction:
Genes are the primary structural and functional units of heredity. These are basically the sequences of nucleotides containing the bases, namely; A (adenine), T (thymine), G (guanine), and C (cytosine). Genes are precisely located on the chromosomes. Mutations in the genes often lead to the deoxyribonucleic acid (DNA) damage or the disruptive phenotypic traits.
Answer to Problem 1MC
Correct answer:
Locus is being defined as the position where the gene resides on chromosomes. Also, the alleles are known to be the variable forms of genes.
Explanation of Solution
Explanation for the correct statement:
Option (a) given for the definition of locus: The place where the genes are located along with the definition of alleles: The unidentical form of the genes is correct. As, the locus is generally defined in a way as the definite position at which genes are located on the chromosomes, whereas allele is the unidentical forms of the gene present on different chromosomes. Therefore, this option is correct.
Explanation for incorrect answer:
Option (b) as given for the definition of the locus, is the position at, which genes are placed, is correct. On the contrary, variable forms of genes are called polygenic. The term ‘polygenic’ governs two or more than two genes on a single phenotypic character. So, it is the incorrect answer.
Option (c) defined the locus as the position at, which chiasma is placed, along with the definition of an allele as the variable form of the genes. As chiasma is defined as the point at, which the information gets exchanged between the chromatids that are also known as chromosomal crossing over. So, it is the incorrect answer.
Option (d) provided the definition of the locus as the position where traits are placed on chromosomes, and different forms of a gene to be the hybrids. Traits are described as the unique characteristics in an individual which makes one person different from the other in many forms and features, and hybrid is formed when the parents involved are from different species or subspecies. So, it is the incorrect answer.
Hence, option (b), (c), and (d) are incorrect.
Therefore, it can be concluded that genes carrying the information in the form of bases, codes for different proteins are found at a specific place on the chromosome known as a locus, and the unidentical forms of the genes are known as alleles.
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Chapter 11 Solutions
Biology: Life on Earth (11th Edition)
- According to the video “The Biology of Skin Color”, why is it that the allele coding for darker skin did not evolve to protect us from skin cancer? A. Because skin cancer isn't harmful B. Darker skin did develop to protect us from skin cancer C. Because skin cancer usually develops after an individual's reproductive years, so it doesn't affect the ability for someone to pass on their genes D. Because skin cancer usually develops before an individual's reproductive years, so it doesn't affect the ability for someone to pass on their genesarrow_forwardWhich of the following is a phenotype? a. Aa b. red hair c. Heterozygous d. DNAarrow_forwardBefore we understood genetics, the process of passing traits from parents to children was known as… Group of answer choices A. blending B. mixing C. fusion D. combining E. amalgamationarrow_forward
- A pair of contrasting characterscontrolling the same trait is called:A. factors B. lociC. allele D. lineagearrow_forwardWhen Gregor Mendel first proposed his theories on genetics, they were not recognized. This was because: A. Charles Darwin didn't agree with Gregor Mendel's theories. B. The current theory was that traits from parents blended together in their offspring. C. Gregor Mendel proposed that individuals could change their physical traits during their lifetime and pass those new traits on to their offspring. D. Scientists believed there were 5 nucleotide bases, not 4 nucleotide bases.arrow_forwardIn genetics, F stands for filial, which means ________. a. friendly c. final b. offspring d. hairlikearrow_forward
- A sequence of DNA that provides coding information for the construction of proteins is called: A. an allele B. a gene C. a recessive trait D. an amino acidarrow_forwardWhy is it that the allele coding for darker skin did not evolve to protect us from skin cancer? A. Darker skin did develop to protect us from skin cancer B. Because skin cancer usually develops before an individual's reproductive years, so it doesn't affect the ability for someone to pass on their genes. C. Because skin cancer isn't harmful D. Because skin cancer usually develops after an individual's reproductive years, so it doesn't affect the ability for someone to pass on their genesarrow_forwardWhich statement is false when considering alleles and genes? a) A given gene can have many different possible alleles. b) Alleles are alternative forms or variants of genes. c) Individuals can be homozygous or heterozygous, and this refers to which alleles they have for a particular gene. d) An allele is the same thing as a gene.arrow_forward
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- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College