Mitsois/Meiosis
What does it mean for a cell to be haploid?
One copy of each chromosome
What is the predicted phenotypic ratio of the offspring from a dihybrid cross between two individuals that are heterozygous for both traits? (Assuming not linked)
9:3:3:1
A cross with a Tt (tall) pea plant and another short, tt pea plant will result in what probability for a short pea plant?
50%
An organism with two different alleles for a trait is called what?
heterozygous
What is a translocation on chromosomes?
One part of the chromosome is moved to another chromosome.
The type of allele that can be masked, or covered up
recessive allele
A cross with a BB (black guinea pig) and a bb (white guinea pig) will result in what probability of a white guinea pig?
0%
name of the Genotype if an organism's is TT
Homozygous dominant
The somatic cells of a dog have 78 chromosomes. How many chromosomes are in the haploid number?
39
A man who's father had blood type O, and who has type A blood, marries a woman with type AB blood. What is the probability they will have a child with type O blood?
0%
An X-linked dominant allele is inherited from a heterozygous female by
half of her sons
On a pedigree, an individual with a mixture of a dominant and recessive allele is referred to as a
carrier
At the end of meiosis I, how many haploid cells have formed from the original parent cell?
2
Hemophilia is an X-linked recessive disorder. If a female with hemophilia and a male without hemophilia had children, what is the predicted percentage of children who would have hemophilia?
50%
A man with blood type O and a woman with blood type AB have a child. What are the possible genotypes of blood types for the child?
IA i and IBi
If a male has a higher chance of inheriting a trait than a female, this is called a ------- trait
X-linked recessive trait
Assuming no crossing over occurs, how many genetically distinct gametes can a diploid cell with four pairs of homologous chromosomes produce?
24 = 16
In radishes, colour is controlled by two alleles. One for blue colour B, and one for the yellow colour b. Inheritance of these alleles shows co-dominance. What phenotypic ratio would you expect from the cross of two heterozygous plant?
25% blue, 25% yellow and 50% blue and yellow
A man with straight hair has two children with a woman with curly hair. One child has straight hair, and one has wavy hair. What patterns of inheritance for this hair type does this suggest?
Incomplete Dominance
T- brown hair, t-blonde hair
What is the phenotype of an individual with this genotype, Tt?
brown hair