17 Questions
What is a sex-linked trait?
A trait determined by an allele or gene on the sex chromosomes (either X or Y)
How are X-linked traits influenced?
By genes located on the X chromosomes
Why are recessive X-linked traits more common in males than females?
Because males have one X chromosome
What genetic disorder impairs a person's control over blood clotting?
Hemophilia
Which chromosome is much shorter than the X chromosome?
Y chromosome
From the text, which condition is caused by a mutation to the red and/or green retinal photoreceptors located on the X chromosome?
Color-Blindness
Which molecule acts as a genetic code and carries genetic information in living organisms?
DNA
In human cells, which chemical units make up the genetic code carried by DNA?
Adenine, Cytosine, Thymine, Guanine
How many chromosomes do humans typically have?
46
Which statement best describes the role of genes in passing traits from parents to children?
Genes contain the instructions for building and maintaining the body.
What is the pairing of adenine with thymine and guanine with cytosine a part of?
Genetic code formation
What is the difference between genotype and phenotype?
Genotype refers to the two alleles an organism has inherited for a particular gene, while phenotype refers to the observable trait of an organism.
In genetic inheritance, what does a dominant allele do in relation to a recessive allele?
A dominant allele overrules a recessive allele.
What happens in codominance?
Both alleles of a gene are distinctly expressed.
Which genetic inheritance type involves both alleles being partially expressed in an intermediate phenotype?
Incomplete dominance
If a plant has one recessive allele and one dominant allele for a certain gene, what will be the result according to genetic inheritance principles?
The plant will exhibit only the recessive trait.
In genetic inheritance, what is the function of a recessive allele?
A recessive allele is expressed only when two copies are present.
Explore the concept of incomplete dominance and sex-linked traits in genetics. Learn how the colour violet can be a result of incomplete dominance. Understand the difference between X-linked and Y-linked traits.
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