Lecture 14 Bio

Front 1

___________ twins occurs 4 in every 1,000 births, while ___________ twins occurs 12 in 1,000 births.

Back 1

identical or monozygotic; fraternal or dizygotic

Front 2

Fraternal twins can occur when the mother releases ___________ eggs during ovulation and each are fertilized.

Back 2

2

Front 3

Identical twins in essence are ____________ of one another, because they share the same identical set of genes.

Back 3

clones

Front 4

The CF gene has been shown to encode for a protein that serves as a channel in the __________ ____________.

Back 4

cell membrane

Front 5

When a gene undergoes a change in its sequence, the process is known as ______________.

Back 5

mutation

Front 6

In Tay-Sachs disease, the individual is lacking an ____________ that is required to metabolize a fatty compound in the brain.

Back 6

enzyme

Front 7

Cystic fibrosis and Tay-Sachs disease are both have _____________ ___________ inheritance.

Back 7

autosomal recessive

Front 8

Humans have two sets of _______ chromosomes, each set from our parents.

Back 8

23

Front 9

In reproductive organs each gamete will only receive _________set of chromosomes, in a process called__________

Back 9

1; meiosis

Front 10

In the equation [possible combinations = 2n], n stand for _________ ____________.

Back 10

haploid number

Front 11

During meiosis I chromosomal ___________ can occur, which further adds to the level of gamete variation.

Back 11

recombination

Front 12

When a mutation occurs in a body cell it ______ passed on to the next generation, while mutations in gamete cells ___________ passed on to the offspring.

Back 12

is not; are

Front 13

An alteration between one and two sets of genetic material during the reproductive cycle is know as the ____________________ cycle.

Back 13

haploid-diploid