Biology 2.1.6.

Question 1

Crossing over

Answer 1

the exchange of segments of chromatids by breaking and rejoining.

Question 2

Differentiation

Answer 2

when an unspecialised cell becomes specialised to perform a particular function.

Question 3

Homologous chromosomes

Answer 3

one maternal and one paternal chromosome that have the same loci of alleles and are a similar size and length.

Question 4

Organ

Answer 4

a collection of tissues which work together to perform a specialised function.

Question 5

Stem cell

Answer 5

an undifferentiated cell, that is capable of mitosis and differentiating to perform a specialised function.

Question 6

Tissue

Answer 6

a collection of cells which work together to perform a specialised function.

Question 7

Prophase 1 of meiosis

Answer 7

pairing up of homologous chromosomes, forming bivalents where recombination and chiasmata form from crossing-over.

Question 8

Prophase 2 of meiosis

Answer 8

Chromosomes still consist of 2 chromatids, that condense and become visible again.