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15 Cards in this Set
- Front
- Back
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If the parent's of a certain group of offspring are Rr & rr, what is the ratio of dominant compared to recessive?
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1:1
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If the parent's of a certain group of offspring are Rr & Rr, what is the ratio of dominant compared to recessive?
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3:1
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If an unknown genotype is test crossed with a recessive genotype and the outcome shows that only the dominant gene is present, the unknown must be:
a) homozygous dominant b) heterozygous dominant |
a.
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Red flowers are crossed with white flowers. The offspring shows a new pink color. This kind of incomplete dominance is:
a) codominance b) intermediate inheritance |
b.
intermediate inheritance is when a new phenotype is present. Codominance is when both phenotypes are present at the same time(ex. roan calf) |
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If an individual crossed a pea that was green and wrinked with another pea that was yellow and round, would the shape genes affect the colour genes?
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no.
Independent Assortment. The genes that govern pea shape are inherited independently of the ones that contol pea color. |
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What is epistasis?
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Epistasis is when gene(s) mask the expression of other genes.
ex. chicken combs |
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Incomplete dominance ONLY happens when...
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neither gene exerts a dominant influence.
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What is the difference between monohybrid crosses and dihybrid crosses?
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Monohybrid crosses only deal with one trait(pea shape - Ss), while dihybrid crosses deal with two traits at the same time(pea shape & pea color(Cc) - SsCc)
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How do u find a cross over percentage?
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divide the number of recombinations by total number of offspring and then multiply by 100.
- that percent would equal the same amount of distance on a chromosome map(7% = 7 units) |
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Can males be heterozygous for sex linked trait?
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no.
males cannot carry a trait on their Y chromosome, therefore they will only have one trait and that will be on the X, which is given by the mother. |
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A pair of genes seperate during the formation of sex cells. This process is called?
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Segregation
- happens during meiosis |
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Which is the genotype:
a) black b) TT |
TT
- a genotype is the DNA code that refers to the genes an organism contains |
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One gene masks the effect of another. This process is known as the principle of?
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Dominance.
ex. black(T) is dominant over brown coat color(t), therefore the black will mask the brown. |
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Parents: MmSs x mmss
What will the gametes be? |
[MS],[Ms],[mS],[ms] x [ms]
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DdFf x DdFf are crossed. What will the ratio of the f2 be?
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9:3:3:1
9 - dominant for both(D_F_), 3 dominant for D only(D_ff), 3 dominant for F only(ddF_), & 1 both recessive(ddff) |
