Dictionary » H » Heterozygote



noun, plural: heterozygotes

A nucleus, cell or organism possessing two different alleles for a particular gene.


An example is a zygote having one dominant allele and one recessive allele for a particular gene.

Word origin: hetero (different) + zygote
Related forms: heterozygous (adjective)

Compare: homozygote
See also: zygote

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Results from our forum

I need help with this Bio genetics problem. X-linked traits?

... is an X-linked trait where a black coat is determined by the XB allele and a yellow coat by the Xb allele. Black and yellow are co-dominant and a heterozygote has a tortoiseshell coat. a) A yellow female cat is bred to a black tom. Write out the cross to show the genotypes. What are phenotypes ...

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by MellowFellow231
Sun Oct 13, 2013 2:26 am
Forum: Genetics
Topic: I need help with this Bio genetics problem. X-linked traits?
Replies: 1
Views: 1299

Beneficial mutations vs harmful

... out once malaria is no longer a threat to that population. i.e. it's "temporarily beneficial" . Of course, sickle cell is an example of heterozygote advantage, so the normal allele is maintained in the population. But there could have been other examples of "temporarily beneficial" ...

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by wildfunguy
Wed Oct 09, 2013 3:30 pm
Forum: Evolution
Topic: Beneficial mutations vs harmful
Replies: 12
Views: 8501

Genetics problems

... for pod shape and homozygous recessive for plant size: a. What is the phenotype of this plant? b. If this plant was crossed to a dihybrid (heterozygote), what would be the phenotypic ratio of pod shape among the progeny? c. What would be the phenotypic ratio of plant size? d. What would ...

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by jamesandrew
Fri Jan 18, 2013 7:20 am
Forum: Genetics
Topic: Genetics problems
Replies: 3
Views: 4192

Confusion regarding answer to Probability question

... = Z F3 Cross to get F4 [Z x Z x 1/4] + [Z x Z x 1/4] - {[Z x Z x 1/4] x [Z x Z x 1/4]} The part i don't really get is the Probability to get a heterozygote P(Ff). Why is multiplied by two fractions instead of one? ie: why is it (1/2 x 1/2) instead of just 1/2 for say the cross FFxFf.

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by EdwardGentilly
Wed Sep 19, 2012 5:49 pm
Forum: Genetics
Topic: Confusion regarding answer to Probability question
Replies: 1
Views: 1445

Gene Frequency

... A (0.4) a (0.6) to get F2 generation: Frequency of AA = 0.4^2 = 0.16 Frequency of Aa = 2 x 0.4 x 0.6 = 0.48 Frequency of aa = 0.6^2 = 0.36 Your heterozygote (Aa) frequency decreased from F1 to F2…

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by Cat
Sun Sep 09, 2012 4:07 pm
Forum: Genetics
Topic: Gene Frequency
Replies: 8
Views: 8073
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