Why do heterozygous females have red eyes?

Are red eyes dominant or recessive?

In females, the presence of one dominant red encoding allele (XW) will produce red eyes even if the individual is heterozygous for the white allele. Females can be: Homozygous dominant for the red encoding allele – genotype: XWXW; phenotype: red eyes.

Why is it impossible to have a tortoiseshell male offspring?

A veterinarian has adopted a tortoiseshell cat that she claims is a “genetic impossibility” because it is male. Male cats, like human beings, have only one X chromosome in their DNA meaning that they should be unable to inherit different colours.

What is an example of heterozygous?

If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed.

Can female fruit flies have white eyes?

All of the females and all of the males will have red eyes. All of the females will have white eyes; half of the males will have red eyes, and half of the males will have white eyes.

What are two genetic disorders that only affect females?

There are also two conditions that affect only females: The Turner syndrome and the Rett syndrome. The first one is a genetic disease which affects 1 out of 2.500 girls.

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What is the chance that the offspring will have red eyes?

Step 5: One out of four (25% of) offspring will be both inale, and have red eyes.

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