Answer:
1. Mother: TtRr Father: TtRr
2. RT, Rt, rT, rt
4. Possible combinations: RRTT, RRTt, RRtt, RrTT, Rrtt, RrTt, rrtt, rrTT, rrTt
(combine them on the chart, for example, the first one on the left would be RRTT)
5. 9:3:3:1
Explanation:
Anaphase 1 -- a homologous pair is being pulled apart by spindle fibers.
Anaphase 2 -- the spindle fibers attaches to the centromere and pulls 2 pieces of the same chromosome apart.
The difference is significant because the chromosomes are aligned in different directions.
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Answer: the development of the enzyme Rubisco and evolution of oxygenic photosynthesis.
Explanation: One can pick many key steps in early evolution: the development of the first cells, oxygenic photosynthesis, endosymbiosis leading to eukaryote organisms.
One important step was the mutation to the enzyme ribulose bisphospate carboxylase oxygenase (Rubisco) which enabled oxygenic photosynthesis.
The cyanobacteria that had Rubisco changed the planet’s atmosphere by producing oxygen as a by-product of photosynthesis. They were the most successful organisms of the time and have continued as a successful and ubiquitous group of organisms for billions of years.
The production of oxygen changed the direction of evolution profoundly. Later endosymbiosis led to the evolution of plants, with cyanobacteria the ancestors of chloroplasts, making Rubisco one of the most common enzymes on the planet.
Explanation:
It’s an important question because the road to a successful career in science – as with technology, engineering and mathematics, the other STEM fields – can be challenging, often requiring a Ph.D. or other postgraduate training. And once in their fields, there can be political and economic pressures with which to contend. The Bureau of Labor Statistics projects workforce shortfalls for many science fields, though the projected needs differ across the life, physical and natural sciences.
Answer:
Primary consumers are the organisms that feed directly on the autotrophs to obtain energy. These consumers thus help to transfer energy to higher trophic levels that are secondary consumers. An example is the goat feeding on a plant is a primary consumer that directly obtains its energy from the plant.
Explanation:
