There are 60 chromosomes in the somatic cells (body cells) of cattle - Leaving Cert Agricultural Science - Question 10 - 2020
Question 10
There are 60 chromosomes in the somatic cells (body cells) of cattle.
(i) How many chromosomes are in the gametes of cattle?
(ii) Name the organ in which the femal... show full transcript
Worked Solution & Example Answer:There are 60 chromosomes in the somatic cells (body cells) of cattle - Leaving Cert Agricultural Science - Question 10 - 2020
Step 1
How many chromosomes are in the gametes of cattle?
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Answer
Cattle have 30 chromosomes in the gametes. This is due to meiosis, where the chromosome number is halved.
Step 2
Name the organ in which the female gametes are produced.
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Answer
The female gametes are produced in the ovary.
Step 3
Name the type of cell division that produces gametes.
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Answer
The type of cell division that produces gametes is meiosis.
Step 4
Copy and complete this cross in your answerbook.
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Answer
Gametes: (G) x (g)
Offspring genotype: (Gg)
Offspring phenotype: Green
Step 5
Copy and complete the following into your answerbook, to give the possible genotypes and phenotypes from this cross.
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Answer
Possible gametes: (G) (g)
Genotypes of offspring: (GG) (Gg)
Phenotypes of offspring: Green (from GG and Gg), Albino (from gg)
Step 6
What is meant by the term cross breeding?
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Cross breeding is the mating of two different breeds of the same species or crossing two different varieties of plants.
Step 7
State one advantage of a cross breeding system.
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One advantage of cross breeding is hybrid vigor or increased productivity such as higher milk yield or better quality produce.
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