L25 Sex-linkage and recombination of linked genes

1

Which parents determines the sex of the offspring?

1

A male fruit fly is white eyed, which is recessive, and an X-linked gene. What term would we use to describe its genotype?

1

A male fruit fly carries an X chromosome with a white eyed allele, and is mated with a female homozygous for red eye alleles. Which statement would be true?

1

A colour blind male mates with a homozygous non colourblind female. Which statements are true?

1

You perform a dihybrid cross between a heterozygote and a homozygous recessive individual. Instead of the expected 1:1:1:1 ratio, the parental types are far more common and only a small ratio of the offspring are recombinants. What can you conclude and why?

1

Theoretically meiosis should cause all ❌ to have the ❌ type if genes being observed are ❌.

gametes

parental

linked

1

Which statement best describes recombinant frequency?

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The larger the distance between two genes the less likely a chiasmata will be formed between them.

1

A small recombinant frequency indicates a small distance between genes.

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What is the maximum recombination frequency?

1

Choose the correct statements about genetic map units.

• Identify the inheritance patterns of sex-linked genes. • Explain that linked genes show non-independent assortment. • Explain that crossing over leads to recombination of linked genes. • Discuss how recombination frequencies are used to map genes.

L25 Sex-linkage and recombination of linked genes

Which parents determines the sex of the offspring?

A male fruit fly is white eyed, which is recessive, and an X-linked gene. What term would we use to describe its genotype?

A male fruit fly carries an X chromosome with a white eyed allele, and is mated with a female homozygous for red eye alleles. Which statement would be true?

A colour blind male mates with a homozygous non colourblind female. Which statements are true?

You perform a dihybrid cross between a heterozygote and a homozygous recessive individual. Instead of the expected 1:1:1:1 ratio, the parental types are far more common and only a small ratio of the offspring are recombinants. What can you conclude and why?

Theoretically meiosis should cause all ❌ to have the ❌ type if genes being observed are ❌.

Which statement best describes recombinant frequency?

The larger the distance between two genes the less likely a chiasmata will be formed between them.

A small recombinant frequency indicates a small distance between genes.

What is the maximum recombination frequency?

Choose the correct statements about genetic map units.