BIOL 216 Lecture 1

palpebral fissures

Upslanting ________: the imaginary line that goes through the eye is slanted up.

Interphase

________ occurs prior to mitosis and has three parts.

Genome

________: all the genetic information of an organism.

Transverse palmar creases

________: single line going down the hand as opposed to 2.

Spermatids

________ are immature sperm cells that are nonmotile.

Mosaicism

________: some cells will have a normal chromosome count while other will have trisomy 21.

Chromosome

________: thread- like structure containing a collection of genes.

Oogenesis

________ has 2 stages of arrest.

Acrosome

________: cap- like structure in sperm cells that has degradative enzymes to go through the eggs cell membrane.

syndrome

Down ________ can also occur because of mitotic errors.

Genes

________: specific portions of the genome that code for proteins.

Epicanthal folds

________: skin folds of the upper eyelid covering the inner corner of the eye.

Primary oocytes

________ are arrested in prophase I until ovulation happens.

Secondary oocytes

________ are arrested in metaphase II until fertilization occurs.

G2 phase

________: proofreading duplicated chromosomes for any errors.

G1 phase

________: cellular contents are duplicated.

Trisomy

________ 21 is caused by meiotic nondisjunction: 2 homologous chromosomes /sister chromatids ending up in the same pole.

S phase

________: each of the 46 chromosomes are duplicated by the cell.

Genome

all the genetic information of an organism

Genes

specific portions of the genome that code for proteins

Chromosome

thread-like structure containing a collection of genes

G1 phase

cellular contents are duplicated

S phase

each of the 46 chromosomes are duplicated by the cell

G2 phase

proofreading duplicated chromosomes for any errors

Result

2 genetically identical diploid daughter cells

First cells are Spermatogonia

2n2c germ cells

acrosome

cap-like structure in sperm cells that has degradative enzymes to go through the eggs cell membrane

Epicanthal folds

skin folds of the upper eyelid covering the inner corner of the eye

Upslanting palpebral fissures

the imaginary line that goes through the eye is slanted up

Transverse palmar creases

single line going down the hand as opposed to 2

Down syndrome is caused by trisomy 21

3 copies of chromosome 21

Trisomy 21 is caused by meiotic nondisjunction

2 homologous chromosomes/sister chromatids ending up in the same pole

mosaicism

some cells will have a normal chromosome count while other will have trisomy 21