3.3 Meisis

Question 1

Describe the division of meisis

Answer 1

Reduction divioon of a diploid cell to haploid

Question 2

Meiosis is..

Answer 2

making gametes in the reproductive organs

Question 3

Reasons behind meiosis

Answer 3

Most sexual reproducing animals are diploid

To reproduce, these organisms need haploid gametes

2 haploid cells form diploid zygote

Question 4

The 2 divisions of meiosis

Answer 4

1) separation of homologous pairs

2) separation of sister chromatids

Question 5

Homologous chromosomes

Answer 5

Same size, banding pattern, same centromere position

Same genes on the same loci (same genes, maybe dif alleles)

Question 6

Non- disjunction

Answer 6

Failure of chromosomes to separate

Leads to Down Syndrome

Question 7

Karyotyping

Answer 7

Arranging chromosomes pairs according to structure

Question 8

Karyotyping involves

Answer 8

Harvesting cells (from fetus or white blood cells)

Chemically inducing cell division during mitosis when chromosomes condense

Staining photograph chromosomes before arranging then

Question 9

Reasons for pre natal karyotyping

Answer 9

Determing babies gender

Test for chromosomal abnormalities

Question 10

How are cells for karyotyping collected

Answer 10

Aminocentesis

Chorionic Villus Sampling

Question 11

Aminocentesis

Answer 11

Inseting needle throught abdominal wall knto the amniotic cavity in uterus. Amniotic fluid with fetal cells is taken

Question 12

Chorionic Villus Sampling

Answer 12

Tube inserted into cervix. Tiny sample of chorionic villi (with fetal cells) is taken from placenta

Question 13

What is the abnormality that causes Down Syndrome

Answer 13

3 chromosomes on the 21st position