#Question id: 18867
#Unit 13. Methods in Biology
#Question id: 9246
#Unit 9. Diversity of Life Forms
The main cause of the increase in the amount of CO2 in Earth's atmosphere over the past 150 years is
#Question id: 5216
#Unit 11. Evolution and Behavior
Alu elements account for about 10% of the human genome. What does this mean?
#Question id: 5527
#Unit 5. Developmental Biology
Ectoderm cells related with anterior neural crest cells condense and form
#Question id: 4742
#Unit 8. Inheritance Biology
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?