science 8th..............................., Cheat Sheet of Environmental science

they're past assignments i did in science class

Typology: Cheat Sheet

2019/2020

Uploaded on 12/21/2021

anderson-santos-argueta
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Name: ________________________________ Genetics & Reproduction Practice
The diagram below shows a simple animal cell. To the right of the cell, two cell structures have
been enlarged and labeled C and D. A portion of structure C has been enlarged and labeled E.
A B C
E
D
A description of each structure is provided in the chart below. Complete the chart by
identifying each structure. [1]
Letter
Description of Cell Structure
Name of Cell Structure
A
smallest functional unit for all living organisms
B
organelle that contains the genetic material.
C
structure that contains many units of hereditary information
D
a single unit of hereditary information
E
double-stranded molecule composed of genetic material
The diagrams below represent reproduction in two different types of organisms, amoebas and birds.
Amoeba
Birds
1. Explain why the bird offspring will differ from its parents more than the ameba offspring will differ
from its parent. [1]
P
aren
t cell
Offspring
M
ale parent
Offspring
Female
parent
DNA
Chromosones
cells
tissue
The bird offspring will differ because it has 2 parents and the amoeba only has one parent and its copying the exact DNA from its parent.
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Name: ________________________________ Genetics & Reproduction Practice The diagram below shows a simple animal cell. To the right of the cell, two cell structures have been enlarged and labeled C and D. A portion of structure C has been enlarged and labeled E. A B C E D A description of each structure is provided in the chart below. Complete the chart by identifying each structure. [ 1 ] Letter Description of Cell Structure Name of Cell Structure A smallest functional unit for all living organisms B organelle that contains the genetic material. C structure that contains many units of hereditary information D a single unit of hereditary information E double-stranded molecule composed of genetic material The diagrams below represent reproduction in two different types of organisms, amoebas and birds. Amoeba Birds

  1. Explain why the bird offspring will differ from its parents more than the ameba offspring will differ from its parent. [1] P aren t cell Offspring M ale parent Offspring Female parent

Name: ________________________________ Genetics and Reproduction Practice The diagram below shows a series of stages after a form of reproduction carried out by sea urchins.

  1. Between which two consecutive stages did fertilization occur? [1] and
  2. Do sea urchins reproduce sexually or asexually? Circle the correct answer and give one piece of evidence to support your answer. [1] Circle one: sexually asexually Evidence:
  3. Identify each gamete? [1} male gamete: ________________________ female gamete: ___________________
  4. Which form of cell division is occurring between stage B to stage E? [ 1 ] _____________________
  5. How many cells will the developing sea urchin have at stage F? [ 1 ] _______cells
  6. If the cell in stage B has 42 chromosomes, how many chromosomes are in each cell for stage D? ___
  7. If the cell in stage B has 42 chromosomes, how many chromosomes are in each gamete? ______
  8. Why do human egg and sperm cells have only 23 chromosomes when human body cells have 46 chromosomes? [1] male gamete female gamete Stage A (^) Stage B Stage C (^) Stage D Stage E Stage F A (^) C C C