Sex-Linked Traits.

What is the inheritance of color blindness an example of?

• co-dominance

• continuous variation

• karyotype cross

• sex linkage

For haemophilia, let H be the normal allele and h the mutant allele.

Which is the genotype of the unaffected male?

• X^hY

• X^HX^H

• X^HX^h

• X^HY

Which of the following explains why color blindness is more common in males? Tick two.

• The mutant allele for color blindness is carried by the X chromosome.

• The mutant allele for color blindness is carried by the Y chromosome.

• Male has only one X chromosome, so either allele is expressed.

• Female has two X chromosomes, so either allele is expressed.

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NGSS.HS-LS3-1

Color blindness is carried by the X chromosome.

A mother is a carrier of color blindness. Her husband has normal vision.

The probability of having a color blind offspring is _____ percent.

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

The diagram shows the sex chromosomes of a woman and of a man. Their genotypes for a recessive sex-linked condition are also shown.

What are the chances that their daughter will show the sex-linked condition?

• 0%

• 25%

• 50%

• 75%

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

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 visual representation of an individual's chromosomes is a 

• phenotype
• genotype
• karyotype
• stereotype

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NGSS.HS-LS3-1

Males are more likely to suffer from a sex-linked disease or disorder because

• males are the weaker sex
• males have less DNA
• males have 1 X chromosome, so the disorder is more likely to be expressed

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

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2