Higher:
我能指出“不同种群”的亲代所生的后代会长成什么样子
Middle:
我能确认孩子遗传到的特征。
Lower:
我知道后代拥有父母双方的特征。
How baby animals similar to their parents?
What happens when different dogs breed?
N/A
The Science Behind the Science
Offspring look like their parents due to genetics. Egg cells from the mother and sperm cells from the father (known as gametes) both contain half of the parent's DNA. This means that each gamete has 23 chromosomes. When the sperm cell fertilises the egg cell, the two halves come together to make a complete set of 46 chromosomes. Offspring may not always look half like the mother and half like the father, though.
A monk named Gregor Mendel did a series of experiments with peas to investigate this phenomenon. He discovered that some genes are dominant, and some genes are recessive. Dominant genes are more likely to show in the offspring than recessive genes, but if two parents have the same trait in a recessive gene, it becomes more likely to show in the offspring. Recessive genes are often the ones that appear to 'skip' generations.
Describe and compare the structure and needs of a variety of common animals (fish, amphibians, reptiles, birds and mammals, including pets).
The study of the characteristics, systems, and behaviours of humans and other animals, and of plants; the interactions and relationships between and among them, and with the environment.
Grouping and classifying.
Gathering and recording data to help in answering questions.
Grade 2 - Animal Life
了解你身边常见的动植物并能简要说明它们的外在特征。
Unlock expert-designed lessons, resources, and assessments tailored for educators. No credit card required.
Claim Your Free Trial →