There are 46 chromosomes in a human somatic (body) cell - Leaving Cert Agricultural Science - Question Question 1 - 2006
Question Question 1
There are 46 chromosomes in a human somatic (body) cell. How many chromosomes are there in a human gamete?
Name the process by which a cell divides into two identic... show full transcript
Worked Solution & Example Answer:There are 46 chromosomes in a human somatic (body) cell - Leaving Cert Agricultural Science - Question Question 1 - 2006
Step 1
How many chromosomes are there in a human gamete?
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Answer
In a human gamete, there are 23 chromosomes. Gametes are produced through meiosis, which halves the chromosome number from the typical 46 found in somatic cells.
Step 2
Name the process by which a cell divides into two identical cells.
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Answer
The process by which a cell divides into two identical cells is called mitosis.
Step 3
Name this man.
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Answer
The scientist shown in the photograph is Gregor Mendel, who is known as the father of genetics.
Step 4
Why is the fruit fly (Drosophila) commonly used in genetic experiments?
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The fruit fly (Drosophila) is commonly used in genetic experiments due to its short generation time, ease of culture, and large number of offspring. Additionally, they have a well-documented genetic variety and mutants, making them ideal for genetic studies.
Step 5
The genotypes of the original parents.
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(TT) X (tt)
Step 6
The gametes produced by each parent.
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(T) (T) and (t) (t)
Step 7
The genotype of the offspring (F1).
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(Tt) (Tt)
Step 8
The phenotype of the offspring (F1).
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Tall (all F1 offspring will express the tall phenotype due to the dominant trait T).
Step 9
The genotypes of the second generation parents.
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(Tt) and (tt)
Step 10
The gametes produced by each parent.
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(T) (t) and (t) (t)
Step 11
The genotypes of the second generation.
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(Tt) (tt)
Step 12
The phenotypes of the second generation.
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Answer
Tall and dwarf (the Tt will be tall, and the tt will be dwarf).
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