a) (i) Where are chromosomes found in a cell? (ii) What type of cell division leads to a reduction in chromosome number? (iii) What term is used to describe the number of chromosomes in a sex cell? b) State three advantages of using fruit flies (Drosophila) for genetics experiments. c) In poultry, the allele for feathered legs (F) is dominant over the allele for clean legs (f). Explain the terms dominant; alleles. Copy the following into your answerbook and complete the cross by filling in the spaces to show the possible gametes, genotypes and phenotype. The genotypes of the parents (FF) x (ff) The gametes produced by each parent ( ) ( ) The genotypes of the offspring ( ) ( ) The phenotype of the offspring d) (i) What is the difference between performance testing and progeny testing? (ii) AI is a technique often used in cattle breeding. What does AI stand for? (iii) List three advantages of using AI for breeding.

Leaving Cert Agricultural Science Genetics: a) (i) Where are chromosomes f

a) (i) Where are chromosomes found in a cell? (ii) What type of cell division leads to a reduction in chromosome number? (iii) What term is used to describe the number of chromosomes in a sex cell? b) State three advantages of using fruit flies (Drosophila) for genetics experiments - Leaving Cert Agricultural Science - Question Question 1 - 2009

Question Question 1

a) (i) Where are chromosomes found in a cell? (ii) What type of cell division leads to a reduction in chromosome number? (iii) What term is used to describe th... show full transcript

Worked Solution & Example Answer:a) (i) Where are chromosomes found in a cell? (ii) What type of cell division leads to a reduction in chromosome number? (iii) What term is used to describe the number of chromosomes in a sex cell? b) State three advantages of using fruit flies (Drosophila) for genetics experiments - Leaving Cert Agricultural Science - Question Question 1 - 2009

Step 1

a) (i) Where are chromosomes found in a cell?

96%

114 rated

Answer

Chromosomes are found in the nucleus of a cell.

Step 2

a) (ii) What type of cell division leads to a reduction in chromosome number?

99%

104 rated

Answer

Meiosis is the type of cell division that leads to a reduction in chromosome number.

Step 3

a) (iii) What term is used to describe the number of chromosomes in a sex cell?

96%

101 rated

Answer

The term used to describe the number of chromosomes in a sex cell is 'haploid.'

Step 4

b) State three advantages of using fruit flies (Drosophila) for genetics experiments.

98%

120 rated

Answer

Fruit flies can be easily cultured in bottles.
They have a short life cycle of about two weeks.
They produce large numbers of offspring.

Step 5

c) Explain the terms dominant; alleles.

97%

117 rated

Answer

Dominant refers to the allele that is expressed in the heterozygous condition, while alleles are different forms of a gene.

Step 6

c) The genotypes of the parents

97%

121 rated

Answer

(FF) x (ff)

Step 7

c) The gametes produced by each parent

96%

114 rated

Answer

(F) (F) for the first parent and (f) (f) for the second parent.

Step 8

c) The genotypes of the offspring

99%

104 rated

Answer

(Ff) (Ff)

Step 9

c) The phenotype of the offspring

96%

101 rated

Answer

Feathered legs.

Step 10

d) (i) What is the difference between performance testing and progeny testing?

98%

120 rated

Answer

Performance testing involves comparing records of an animal's performance, often with animals kept under similar conditions. Progeny testing compares records of an animal's offspring performance to evaluate the offspring's performance in relation to the original animal.

Step 11

d) (ii) What does AI stand for?

97%

117 rated

Answer

AI stands for Artificial Insemination.

Step 12

d) (iii) List three advantages of using AI for breeding.

97%

121 rated

Answer

It allows for the selection of superior genetic traits.
It reduces the risk of disease transmission.
It is often more cost-effective and efficient in cattle breeding.

a) (i) Where are chromosomes found in a cell?

a) (ii) What type of cell division leads to a reduction in chromosome number?

a) (iii) What term is used to describe the number of chromosomes in a sex cell?

b) State three advantages of using fruit flies (Drosophila) for genetics experiments.

c) Explain the terms dominant; alleles.

c) The genotypes of the parents

c) The gametes produced by each parent

c) The genotypes of the offspring

c) The phenotype of the offspring

d) (i) What is the difference between performance testing and progeny testing?

d) (ii) What does AI stand for?

d) (iii) List three advantages of using AI for breeding.

Join the Leaving Cert students using SimpleStudy...