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WorksheetsSex Linked Traits
Total questions: 17
Worksheet time: 51mins
The sex of a child is determined by:
Whether the father's sperm contains an X or Y chromosome
Whether the mother's egg contains an X or Y chromosome
The age of the parents
The presence or absence of proteins in the mother's womb
An individual's sex is determined by:
1 of 23 chromosomes
2 of 46 chromosomes
4 of 92 chromosomes
2 of 23 chromosomes
Males are more likely to suffer from a sex-linked disease or disorder because:
Males have more testosterone
Males have less DNA
Males have 1 X chromosome, so the disorder is more likely to be expressed
Females have 1 Y chromosome to mask the trait
When we say that a woman is a carrier for a genetic disease or disorder it means that:
She has 1 gene, but not the disorder
She has 2 genes for the disorder
She can pass the gene only to male children
She can pass the gene only to female children
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be a:
Sex-linked trait
Polygenic trait
Co-dominant trait
Incomplete dominance trait
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
XXh
XhXh
XX
XhY
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
XXh
XhXh
XY
XhY
Hemophilia (h) is an x-linked recessive trait. What are the chances that a daughter would be a carrier? NOTE: X and XH mean the same thing.
0%
25%
50%
100%
The bison herd on Konza Prairie has a sex-linked trait known as “rabbit hock” in which the knee of the back leg is slightly malformed. A male bull that is normal mates with a cow that is a carrier for rabbit hock. What are his chances of producing a normal male?
0%
25%
50%
100%
The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?
0%
25%
50%
100%
In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?
Male with white eyes
Female with red eyes
Male with red eyes
Female with white eyes
Which of the following is TRUE?
Sex chromosomes determine gender
Males have XY; Females have XX
Non-sex chromosomes are called autosomes
All of these
If this couple has a child, what are the odds that a SON will be colorblind (Hint: has a little "c")?
50%
25%
100%
75%
Why are men 16 times more likely to be color-blind than women?
To be color-blind, you must have a Y chromosome
Females must get TWO recessive genes for the trait where as males only need ONE of the recessive genes
Color-blindness is caused by testosterone
Color-blindness is caused by the same gene as baldness
How many PAIRS of sex chromosomes do humans have?
23
46
1
2
