Genetics, blood type gene has two alleles, each allele has genotype A, B or O. The A and B are dominant, and O is recessive. So allele A combined with allele O is type A. Similarly, BO is type B, AA is type A, BB is type B, OO is type O, and AB is typeAB.
If both parents have type A blood, then the alleles could be AA or AO, thus the allele A frequency is 75%, allele O frequency is 25% for both parents.
So the chance of alleles OO is 25% × 25% = 6.25%,
alleles AA is 75% × 75% = 56.25%,
alleles AO is 75% × 25% = 18.75%,
alleles OA is 25% × 75% = 18.75%.
Since AA, AO and OA are blood type A, and OO is blood type O, thus their child has 6.25% chance to be blood type O and 93.75% chance to be blood type A.
The +/- is called the rhesus factor, with + being dominant, and - being recessive.
So if both parents are -, the kids are always -, otherwise the kids might be + or -.
Child Blood Type Estimate Table:
Father's Blood TypeABABOMother's
Blood
TypeAA/OA/B/AB/OA/B/ABA/OBA/B/AB/OB/OA/B/ABB/OABA/B/ABA/B/ABA/B/
Outdoor CO2 levels are frequently as low as 400 ppm, whereas interior CO2 levels typically vary from 420 to 1000 ppm. CO2 values under 1000 ppm are considered healthy levels. The best way is to open all the windows of classroom.
What are the health risk of high CO₂ level?
- People may have moderate symptoms like sleepiness, restlessness, an accelerated heart rate, and breathing difficulties if levels exceed 1000 ppm.
- This is particularly problematic in educational settings when learning new material calls for increased focus and attention from students.
- In addition to causing significant discomfort, levels of CO2 above 2000 ppm prevent pupils from functioning at their best in class and, over time, impair the growth of their cognitive abilities.
- In addition to the above described symptoms, there are others including nausea, poor focus, and feeling stifled.
- Indoor CO2 levels are normally below 1000 ppm, but if there are more than 20 pupils and teachers in a closed space, the CO2 levels will naturally rise, and it is not unusual for them to exceed 3000 ppm.
Learn more about the Global warming with the help of the given link:
brainly.com/question/3553382
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It compares the number of mutations that exist in the DNA of two different species.
Answer:
When the environment changes fast and reproduction is needed.