Biol 113 genetics Exam Questions and Answers| New Update with 100% Correct Answers
who is known as the 'father of genetics' Gregor Mendel
Which plants and characters did Mendel use in his work Pea plants. Flower colour, position,
seed colour, shape, pod shape, colour, stem length
What is Mendels first law of segregation The two forms of a gene present in each parent
segregate independently
In a monohybrid cross what is the ratio of dominant phenotype to recessive 3:1
What diagram is used to predict the outcomes of crosses punnett square
Why and how is a test cross done To determine the genotype of a dominant phenotype.
Cross the subject with a homozygous recessive individual.
What is mendels law of independent assortment each pair of alleles assorts independently
of each other pair of alleles during gamete formation.
in a dihybrid cross what ratio is observed 9:3:3:1
General formula for working out probability of progeny deal with each pair separately and
multiply together
Who discovered Chromosomes Walter sutton
How many cells does meiosis produce 4 non identical haploid cells
, How does chromosome behaviour in meiosis explain mendels segregation law each allele is
on a different member of a homologous pair of chromosomes and move to opposite poles in
anaphase 1
How does chromosome behaviour in meiosis explain mendels law of independent assortment
explained by the random way that the homologous pairs line up in metaphase 1
Sources of genetic variability in sexual life cycles mutation, independent assortment,
crossing over, random fertilisation
What is a recombinant phenotype combination of phenotypes differ from that found in
either of the parents
When does crossing over occur during the pachytene phase of prophase 1. begins with
synapsis. In the synaptonemal complex, sections of the chromosomes can exchange
Formula for recombination frequency (number of recombinants/ total number of progeny) x
100
What is the recombination frequency for genes on different chromosomes 50% due to
independent assortment
causes of deviations from mendelian ratios sex-linkage, incomplete dominance, co-
dominance, pleiotropy, polygenic inheritance, epistasis
Why does sex linkage occur The Y chromosome is much shorter than the X chromosome
meaning in males only one copy of a gene is needed to be expressed
What is incomplete dominance Where a dominant alleledoes not completely mask the
effect of a recessive allele
who is known as the 'father of genetics' Gregor Mendel
Which plants and characters did Mendel use in his work Pea plants. Flower colour, position,
seed colour, shape, pod shape, colour, stem length
What is Mendels first law of segregation The two forms of a gene present in each parent
segregate independently
In a monohybrid cross what is the ratio of dominant phenotype to recessive 3:1
What diagram is used to predict the outcomes of crosses punnett square
Why and how is a test cross done To determine the genotype of a dominant phenotype.
Cross the subject with a homozygous recessive individual.
What is mendels law of independent assortment each pair of alleles assorts independently
of each other pair of alleles during gamete formation.
in a dihybrid cross what ratio is observed 9:3:3:1
General formula for working out probability of progeny deal with each pair separately and
multiply together
Who discovered Chromosomes Walter sutton
How many cells does meiosis produce 4 non identical haploid cells
, How does chromosome behaviour in meiosis explain mendels segregation law each allele is
on a different member of a homologous pair of chromosomes and move to opposite poles in
anaphase 1
How does chromosome behaviour in meiosis explain mendels law of independent assortment
explained by the random way that the homologous pairs line up in metaphase 1
Sources of genetic variability in sexual life cycles mutation, independent assortment,
crossing over, random fertilisation
What is a recombinant phenotype combination of phenotypes differ from that found in
either of the parents
When does crossing over occur during the pachytene phase of prophase 1. begins with
synapsis. In the synaptonemal complex, sections of the chromosomes can exchange
Formula for recombination frequency (number of recombinants/ total number of progeny) x
100
What is the recombination frequency for genes on different chromosomes 50% due to
independent assortment
causes of deviations from mendelian ratios sex-linkage, incomplete dominance, co-
dominance, pleiotropy, polygenic inheritance, epistasis
Why does sex linkage occur The Y chromosome is much shorter than the X chromosome
meaning in males only one copy of a gene is needed to be expressed
What is incomplete dominance Where a dominant alleledoes not completely mask the
effect of a recessive allele
