The answer is C. We can suppose that the Grey gene is "A" and Black gene is "a". So the gene of heterozygous grey fruit fly is "Aa", and the black-bodied fruit fly is "aa". After mating, the offspring can get only "a" from balck-bodied fruit fly and has equal opportunity to get a "A" or "a" from heterozygous grey fruit fly. If the gene of offspring is "Aa", it will be grey. If "aa", it will be black. So the proportion of being black is 0.5.
Interstitial cells surrounding seminiferous tubules produce testosterone in response
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Viruses lack the properties of living things:
1. They have no energy metabolism
2. They do not grow
3. They do not respond to stimuli
4. They do not reproduce independently- they have to replicate by invading living cells.
Answer:
Smooth and cardiac
Explanation:
Smooth and cardiac muscles are both involuntary.
This means we do not consciously control them. Smooth muscles are found, for example, in the esophagus, and small intestine. The cardiac muscles are found in the heart.
The skeletal muscles are those that we control consciously, such as the muscles for moving our arms and legs.
A - Viruses cannot survive outside of a host whereas bacteria can.
