Unit 6 Variation Review_7th Grade

 Every organism requires a set of instructions that specifies its traits. This information is carried with the cells of the organism. Which set of statements BEST describes hereditary information in eukaryotic cells?

• Genes are made up of chromosomes and both are found in the cell’s cytoplasm.

•  Chromosomes are made up of genes and both are found in the cell’s cytoplasm.

• Genes are made up of chromosomes and both are found in the cell’s nucleus.

• Chromosomes are made up of genes and both are found in the cell’s nucleus.

Science is the systematic knowledge of the physical or material world gained through observation and experimentation. Which BEST describes the part of the physical world that is studied in biology?

• Earth’s materials and structures

• matter and its interactions

• living things

• energy and forces

A biologist was in a forest when he came across a family of squirrels hiding nuts for the winter. The biologist was interested in this behavior, so he stayed and watched the squirrels for a few hours. He recorded what he observed in a notebook. Which of the following explains why this type of research is NOT considered an experiment?

•  The biologist did not observe the squirrels for long enough to collect data.

• The biologist came across the squirrels by chance and had no formal plan.

• The biologist observed the squirrels and did not test variables.

• The biologist did not collect valid data on the different species of squirrels present.

A purebred plant that has a genotype of GG is crossed with a purebred plant that has the genotype gg. What are all the possible genotypes of the offspring?

• GG, gg, and Gg

• only Gg

• only GG

• GG and gg

For pea plants, T represents a dominant allele for tall pea plants and t is the recessive allele for short pea plants.  If two plants with the Tt genotype are crossed, what is the probability that offspring will exhibit the dominant trait?

• 100%

• 75%

• 50%

• 25%

A mother and father have two daughters.  The daughters have some similar and some different physical features.  Which statement BEST explains why the girls’ physical appearance includes both similar and different features?

• one daughter received fewer genes than the other

• each daughter received a different number of genes from each parent

• the daughters received a random set of genes from both parents

• one daughter received all her genes from her father and the other daughter received all her genes from her 

       mother.

 For a particular trait, the allele F is dominant over the allele f. The Punnett square below shows the genetic cross of two parents, each with the genotype Ff. Which box in this Punnett square would contain two dominant alleles?

• 1

• 2

• 3

• 4

 In the process of reproduction, hereditary information is passed from one generation to the next.  Some organisms reproduce asexually. How does an offspring produced by asexual reproduction (mitosis) compare to the parent organism?

• its genetic information is completely different from the parent organism

• one-quarter of its genetic information is the same as the parent organism

• one-half of its genetic information is the same as the parent organism

• all of its genetic information is the same as the parent organism

A partially completed Punnett square is shown. Based upon the genotypes of the offspring, which of the following BEST represents the missing genotype of the parent represented at the top of this Punnett square?

• Ss

• SS

• ss

• cannot be dtermined

  There are two kinds of reproduction, asexual (mitosis) and sexual (meiosis). Which of the statements correctly states a difference between the two types of reproduction?

• Sexual reproduction involves transfer of genetic information, but asexual does not.

• Asexual reproduction involves meiosis, but sexual reproduction does not.

• Sexual reproduction involves two parent organisms, while asexual reproduction does not.

• Asexual reproduction produces new organism, while sexual reproduction does not.