Genetics HL - meiosis & variation

Crossing over takes place in

• prophase I of meiosis

• anaphase of mitosis

• prophase of mitosis

• prophase II of meiosis

• metaphase I of meiosis

Homologous chromosomes separate randomly during:

• crossing over

• anaphase I

• anaphase II

• prophase I

• metaphase I and II

The first stage of crossing over is called:

• leptotene

• diplotene

• pachytene

• diakinesis

• zygotene

During crossing over chiasmata are visible in:

• diplotene

• pachytene

• diakinesis

• leptotene

• zygotene

During meiosis, centromeres break in:

• crossing over

• anaphase II

• anaphase I

• metaphase I

The process which break existing linkages between genes is called...

Main sources of variation in sexually reproducing organisms include:

• point mutations

• chromosome mutations

• crossing over

• random fusion of gametes

• independent alignment of chromosomes in meiosis

The diploid number of a cell is 6. How many possible combinations can be seen in meiosis

• 2

• 3

• 6

• 8

Conitnuous variation is mainly caused by:

• recessive mutations

• many genes coding for the same trait

• codominance

• one gene coding for a given trait

The organism is heterozygous for two traits. How many types of gametes it will produce?

• 2

• 4

• 8

• 1