Question 1
If nondisjunction occurs in meiosis I of a mother, what proportion of her gametes could have been fertilized by a normal sperm to produce a child with Turner syndrome?
◦ 0
◦ 1/4
◦ 1/2
◦ 3/4
◦ 1
Question 2
In an allopolyploid organism, what is true regarding the fertility of interspecies hybrids?
◦ Interspecies hybrids are fertile due to nonhomology of chromosomes.
◦ Chromosome doubling by nondisjunction in gametocytes can lead to homologous chromosome pairing, disjunction, and fertile hybrids.
◦ Interspecies hybrids will be fertile so long as there is an odd number of chromosomes in the offspring.
◦ Mitotic nondisjunction results in haploid cells.
◦ Meiotic nondisjunction produces three haploid gametes and one diploid gamete.
Model Organism Neurospora
TrUe....FaLsE
Fertility and Population Density, 1850
Income per Capita versus Total Fertility Rate
The developing organism senses maternally transmitted environmental cues