Font size
WorksheetsIB biology Topics 3 and 10 (not speciation)
Total questions: 23
Worksheet time: 18mins
What is defined as a heritable factor that consists of a length of DNA and influences a specific characteristic?
Gene
Allele
Locus
Promotor
What is a locus?
An insect pest
The position of a gene on a chromosome
Part of a chromosome that is not transcribed
Part of a chromosome made of heterochromatin
What best describes an allele ( the alternative forms of a gene)?
Must be different on sister chromatids
Must be the same on homologous chromosomes
May be the same on homologous chromosomes
Must be different on homologous chromosomes
Mutations may be... (choose all that apply)
Deleterious (harmful)
Neutral (harmless)
Beneficial (positive)
None of these
A genome includes...
All of the genetic information in an organism
The number of genes in an organism
Only the coding DNA
Coding DNA and promotor/repressor regions
Which DNA sequence would be suitable for DNA profiling?
ATTCGTGAATCAGCC
ATTCGATTCGATTCGA
CCGACTAAGTGCTTA
ATTCGTGAATTTGCG
Which event occurs only in meiosis
Fusion of gametes to genetic variation
Random separation of chromatids
Random separation of homologous chromosomes
Replication of chromosomes
It is possible for parents to have 4 children with different ABO blood groups. What blood groups would the parents have?
Mother O and Father O
Mother A and Father B
Mother AB and Father O
Mother AB and Father AB
Which technique separates proteins according to size?
Treatment with restriction endonuclease
PCR
Gel electrophoresis
DNA profiling
What is true of homologous chromosomes
They form pairs in prokaryotes
They are the same length in karyograms
They have identical DNA sequences
They carry the same genes at the same loci
They have identical alleles
In which situation are alleles exchanged?
During separation of sister chromatids in anaphase II
In the transmission of linked genes
During fertilisation
When chiasmata are formed between non-sister chromatids
Dominant alleles...
Mask the effect of recessive alleles
Are always more common in the population than recessive alleles
May cause genetic diseases
Are always beneficial compared to recessive alleles
Have joint effects with recessive alleles in co-dominant traits
In cats the tabby gene allele M codes for stripes and m for blotches. The Agouti gene allele 'A' codes for 2-toned hair, allowing patterns to be seen, and allele 'a' for plain black fur. What proportion of the offspring would be black in a cross between 2 cats heterozygous for both traits?
1 out of 16
3 out of 16
4 out of 16
9 out of 16
This is the cross that led to the discovery of non-Mendelian ratios in Morgan's experiments with Drosophila. Which offspring would be recombinants?
b+ b vg+ vg
b b vg vg+
b+b+ vg+vg+
b b vg vg
What is produced by somatic cell nuclear transfer?
Adult sheep
Cloned embryos
Rooted stem cuttings
Genetically modified food
Which of these is a major health issue resulting from the Chernobyl nuclear accident in 1986?
Coronary thrombosis
Cholera
Sex-linked disorders
Thyroid cancers
Which description correctly describes the named phase of meiosis I?
Prophase I - recombination occurs only between sister chromatids
Metaphase I - homologous chromosomes join together at each end of the cell
Anaphase I - homologous chromosomes are pulled apart
Telophase I - two diploid nuclei are produced
What does this chart tell you about the inheritance of the blood disorder being studied?
The allele is autosomal recessive
The allele is autosomal dominant
The allele is sex-linked
There is not enough information in the chart to know
Some of the ratios that Morgan investigated in genetic crosses did not correspond to the expected Mendelian ratios. What was the cause?
He used insects rather than plants for his corsses
He counted more reliably than Mendel had
The genes he looked at in his crosses were linked
Drosophila has more genes than plants
The genes he looked at in Drosophilla are all on separate chromosomes
Which phase of nuclear division is shown and what is the correct order?
Meiosis I - 4, 3, 2, 1
Meiosis II - 4, 3, 2, 1
Mitosis - 4, 3, 2, 1
Meiosis II - 3, 2, 4, 1
Meiosis II - 4, 2, 3, 1
Which of the 3 potential fathers is most likely to be the child's father?
Dad 1
Dad 2
Dad 3
None of them can be
It could be more than one of them
How can the proteome of a species contain more proteins than there are genes in the genome?
Some proteins have more than one polypeptide chain
There are some genes that code for several proteins
Not all proteins are coded for in the genome
Some proteins are coded for by other proteins
What is a characteristic of the haploid number of Eukaryotic chromosomes?
It doubles in mitosis
It is fixed for each species
It is an even number for each species
It is positively correlated with an organisms mass
