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13 Cards in this Set

  • Front
  • Back
___________ twins occurs 4 in every 1,000 births, while ___________ twins occurs 12 in 1,000 births.
identical or monozygotic; fraternal or dizygotic
Fraternal twins can occur when the mother releases ___________ eggs during ovulation and each are fertilized.
Identical twins in essence are ____________ of one another, because they share the same identical set of genes.
The CF gene has been shown to encode for a protein that serves as a channel in the __________ ____________.
cell membrane
When a gene undergoes a change in its sequence, the process is known as ______________.
In Tay-Sachs disease, the individual is lacking an ____________ that is required to metabolize a fatty compound in the brain.
Cystic fibrosis and Tay-Sachs disease are both have _____________ ___________ inheritance.
autosomal recessive
Humans have two sets of _______ chromosomes, each set from our parents.
In reproductive organs each gamete will only receive _________set of chromosomes, in a process called__________
1; meiosis
In the equation [possible combinations = 2n], n stand for _________ ____________.
haploid number
During meiosis I chromosomal ___________ can occur, which further adds to the level of gamete variation.
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.
is not; are
An alteration between one and two sets of genetic material during the reproductive cycle is know as the ____________________ cycle.