WorksheetsH.B.4 Heredity-Inheritance and Variation of Traits (EOCEP)
Total questions: 15
Worksheet time: 7mins
What is the significance of the crossing over that occurs between homologous chromosomes during meiosis?
It causes chromosomes to condense.
It maintains the diploid number of the species.
It reduces chromosomes from 2n to n.
It results in genetic variation due to the new gene combination.
DNA replication occurs before meiosis I but not before meiosis II. Why is that important?
It results in uneven division of the cytoplasm.
It results in increased genetic diversity for the species.
It results in offspring that are genetically identical to the parents.
It results in daughter cells with the haploid number of chromosomes.
Which statement about meiosis is true?
Meiosis makes two identical cells with the diploid number of chromosomes.
Meiosis makes two different cells with the diploid number of chromosomes.
Meiosis makes four identical cells with the haploid number of chromosomes.
Meiosis makes four different cells with the haploid number of chromosomes.
Which statement best distinguishes meiosis from mitosis?
Meiosis replicates then separates genetic information.
Meiosis combines the genetic information of egg and sperm.
Meiosis maintains the cell's original chromosome number.
Meiosis reduces the cell's original chromosome number by half.
How is the process of independent assortment dependent upon processes such meiosis and random orientation in order to increase genetic diversity.
Independent assortment is not possible until meiosis has separated all four chromatids of the homologous chromosomes after two divisions, then random orientation of these chromatids allows them to assort independently into gametes.
Meiosis allows for the pairing of maternal and paternal homologous chromosomes so that the resulting gametes are getting a chromosome that is composed of entirely maternal or paternal genetic material.
Meiosis maintains the diploid chromosome number through the first cell division , then random orientation of homologues in the second division allows the chromosome number to be reduced to haploid through independent assortment.
Random orientation ensures that there is no pattern to the alignment of paired maternal and paternal homologous chromosomes in metaphase, allowing for independent assortment of those chromosomes during anaphase.
What process during meiosis is MOST likely responsible for creating the variation seen in the kitten compared to its two parents?
independent assortment of alleles
separation of the sister chromatids
pairing of homologous chromosomes
production of haploid daughter cells
Blood type is determined by multiple alleles. A woman with type O blood marries a man who is heterozygous for type B blood. What is the probability that their first child will have type AB blood?
0%
25%
50%
75%
In wrens, feather color inheritance is an example of incomplete dominance, so B represents black feathers, and W represents white feathers. If a wren with genotype WW is mated with a wren with genotype BB, what is the likelihood that their offspring will have grey feathers?
25%
50%
75%
100%
A four o'clock plant with pink flowers is crossed with a plant that has white flowers. All the offspring produced have pink flowers. What pattern of inheritance does this represent?
sex-linked
incomplete dominance
complete dominance
codominance
Which explanation best describes the main difference between sex cell and somatic cell mutations?
Only mutations that occur in somatic cells can be passed to the offspring of an organism?
Only mutations that occur in sex cells are harmful, and usually lethal to organisms.
Mutations that take place in sex cell can be passed to the offspring of the organism.
Mutations that takes place in somatic cell are always harmful, usually lethal to the organism.
Under which condition is a point mutation in a chromosome least likely to affect the function of the gene?
when the mutated gene codes for a different but functional protein
when the mutated chromosome is inhibited from being part of protein synthesis
when the mutated chromosome is deleted from the gene before protein synthesis
when the mutated gene codes for the same protein as coded by non-mutated gene
Klinefelter syndrome is a chromosomal condition that affects males. Males with this syndrome have an extra copy of the X chromosome in each cell. What causes the cell to have an extra X chromosome?
multiple mitotic divisions of a cell causing duplication of the X chromosomes
failure of a cell to divide after undergoing all stages of meiotic division
excess replication of the X chromosome before the beginning of meiosis
failure of homologous chromosomes to separate during meiosis
Which statement about chromosomes is true?
Chromosomes are responsible for helping the cell split during cell division
Chromosomes are made of DNA, which contains the cell's genetic information
Chromosomes are only found in eukaryotic cells
Chromosomes are only found in reproductive cells, like eggs and sperm.
Which statement best explains the relationship among genes, DNA and chromosomes?
Chromosomes are specific location on a gene, and genes are made of tightly coiled thread of DNA.
Genes are specific location on chromosome and chromosome are made of a lightly coiled thread of DNA
DNA is a long thread that is tightly coiled into a gene and located on a small section of a chromosome.
Genes are composed of tightly coiled chromosomes and are located on a single thread of DNA
A single-stranded sequence of DNA is shown.
TAC CGC AAG
Which series represents the complementary strand of DNA?
CGT TAT GGA
ATG GCG TTC
GCA ATA CCT
AUG GCG UUC
