Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
29 Cards in this Set
- Front
- Back
|
What are genetic diagrams used for? |
To give the probablity of two parents passing on a particular phenotype |
|
|
What are the majority of genes in humans? |
autosomal |
|
|
How many genes are located on the X chromosome in humans? |
2000 genes |
|
|
How many genes does Y chromosome carry? |
78 genes |
|
|
Which gene triggers the development of the embryo from being female into being male? |
SRY |
|
|
When talking about sex linked inheritance what should you always add when stating phenotype?? |
gender |
|
|
What must the mother be of all males with a recessive sex linked condition? |
carrier |
|
|
If a father has a recessive sex linked condition what must the daughter be? |
carrier of condition. |
|
|
When will females have a sex linked recessive condition? |
If homozygous for recessive allele. |
|
|
What is monohybrid inheritance with codominance? |
More than one allele contributes to inheritance. |
|
|
How should you layout your answers to monohybrid inheritance? |
Parental phenotype, Parental phenotype, gametes (Incircles), diagram, offspring genotype, offspring phenotyoe, ratio |
|
|
What is monohybrid inheritance with codominance? |
More than one allele contributes to phenotype |
|
|
What is dihybrid crosses with no linkage? |
Inheritance of two different characteristics controlled by two different genes found on two different chromosomes. |
|
|
What results in genes on different chromosomes being inherited independently? |
In Meisosis I homologous pairs segregate independently. |
|
|
What are the different gametes that are produced from an individual phenotype: TtBb? |
TB, Tb, tB, tb |
|
|
Why would in a sex linked condition males be more likely to have the condition? |
Males are more liekly to sow a sex-linked condition as they only carry one copy of gene on X chromosome |
|
|
What is the ratio of phenotypes in dihybrid cross with parents that are heterozygous for both chacteristics? |
9:3:3:1 |
|
|
What is epistasis? |
An allele of one epistatic gene masks/inhibits the expression of a second gene. |
|
|
What are the two types of epistasis? |
recessive epistasis or dominant epistasis |
|
|
In recessive epistasis when would the expression of a second gene? |
homozygous recessive genotype. |
|
|
What is the ratio for recessive epistasis? |
9:3:4 |
|
|
What is the ratio for phenotypes in dominant epistasis? |
12:3:1 |
|
|
What is linkage? |
inheritance of genes located on the smae autosomal chromosome. |
|
|
How many genotypes of gametes are produced in linkage without crossing over/ |
2 |
|
|
How many genotypes of gametes are produced in linkage when crossing over has occured? |
4 |
|
|
What happens to the likelihood of the genes being shuffled by crossing over the closer together the loci of genes are? |
lower likelihood if they are closer together. |
|
|
What do two homologous chromosomes come together to form during crossing over? |
bivalent |
|
|
What do non-sister chromatids attach at in crossing over? |
chiasmata |
|
|
when does crossing over occur? |
Meoiosis I. |
