Monogenic inheritance

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What is monogenic inheritance?
Characteristic inherited on a single gene
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What is codominance?
When 2 different alleles occur for a gene and they are both equally dominant
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What happens to the phenotype when codominance occurs?
Both genes are expressed
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A red flower and a white flower breed, the red flower has a gene that produces the red pigment and the white flower doesnt have that gene, however they are both dominant alleles. What is produced?
Pink flowers as the single red allele produces enough pigment to make the flowers pink
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When 2 pink flowers breed together, what would the ratio of their offspring be?
1 red: 2 pink: 1 white
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What does it mean when a gene has multiple alleles?
The gene has more than 2 versions
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Give an example of a gene with multiple alleles
Blood group, you have A, B and O, with A and B being codominant and O being recessive
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Which pair of chromosomes determines sex?
The 23rd pair
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What is the difference in the 23rd pair between males and females?
Females have ** and males have XY and the Y is a lot smaller than the X and contains almost no genetic information
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What is sex linkage?
Characteristics determines by genes carried on the sex chromosomes (sex linked genes)
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How come males have more chance of developing a sex-linked disorder?
Because the Y chromosome doesnt carry much genetic information, this means any recessive gene on the X chromosome thats not on the Y chromosome will make the male have the disorder, whre as females have a better chance of having a dominant allele
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Give an example of a sex linked disorder
Haemophilia- a blood disorder where blood clots occur much slower due to the absence of a protein blood clotting factor
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If a normal female and a haemophilic male reproduce, what is their offspring ratio?
2 female carriers: 2 normal males
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If a female carrier and a normal male reproduce, what is their offspring ratio?
1 normal female: 1 normal male: 1 female carrier: 1 haemophilic male
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Which parents would have to breed to create a haemophilic female?
A female carrier and a haemophilic male (Inherits recessive from both mother and father)
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Other cards in this set

Card 2

Front

What is codominance?

Back

When 2 different alleles occur for a gene and they are both equally dominant

Card 3

Front

What happens to the phenotype when codominance occurs?

Back

Preview of the front of card 3

Card 4

Front

A red flower and a white flower breed, the red flower has a gene that produces the red pigment and the white flower doesnt have that gene, however they are both dominant alleles. What is produced?

Back

Preview of the front of card 4

Card 5

Front

When 2 pink flowers breed together, what would the ratio of their offspring be?

Back

Preview of the front of card 5
View more cards

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