Marbles Is a Calico Cat with a Manx Tail

question 41

Multiple Choice

Marbles is a calico cat with a Manx tail.She wants to have kittens with a male calico,but can't find one.Male calicos are rare;the only ones have the sex chromosome constitution XXY.Male calicos are therefore rare because

• A)all male cats have a dominant gene on the Y chromosome that masks the calico gene on the X chromosome.
• B)most male cats only have one Y chromosome,so it cannot be shut off.
• C)most male cats have only one X chromosome,so it cannot be shut off.
• D)male calico cats lack sex chromosomes.

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Definitions:

Grazing Food Chain

Food chain in which energy is transferred from producers to grazers (herbivores).

Detrital Food Chain

Food chain in which energy is transferred directly from producers to detritivores.

Atmosphere

The layer of gases surrounding a planet or moon, held in place by gravity, essential for life on Earth.

Phosphorus

A chemical element that plays a vital role in biological processes such as energy transfer, genetic information processing, and bone formation.