Dictionary » H » Heterozygous




(1) Of, or pertaining to an individual (or a condition in a cell or an organism) containing two different alleles for a particular trait.

(2) Having dissimilar alleles that code for the same gene or trait.


Example: a zygote having one dominant allele and one recessive allele, i.e. Aa, for a particular trait.

Word origin: G. h├ęteros the other of two, other, different + zygous, which pertains to a zygote.

Related forms: heterozygosity (noun).
Related phrases: heterozygous recessive, heterozygous dominant.

Compare: homozygous.
See also: allele.

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Genetics Pedigree Help Required

... this is an autosomal dominant or an autosomal recessive pattern? Can you not have, if it is autosomal dominant, each affected individual as heterozygous and each unaffected individual homozygous recessive; and if it is autosomal recessive you reverse it so that each affected individual is ...

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by TheBell
Fri Mar 21, 2014 8:49 pm
Forum: Genetics
Topic: Genetics Pedigree Help Required
Replies: 0
Views: 1672

I need help with Punnett Square

... offspring resulting from this testcross? Based on this phenotypic ratio, determine whether the F1 wild-type female was double homozygous or double heterozygous for the eye color and body color alleles. Explain your answer, including the Punnett square for these results. Show a Punnett Square that ...

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by Yokie83
Sun Sep 29, 2013 9:21 pm
Forum: Genetics
Topic: I need help with Punnett Square
Replies: 1
Views: 3161

Do chromosomses ever get competitive?

... in heterozygotes, so heterozygotes are less fit than homozygotes. Since natural selection can only select against alleles, not genotypes, the heterozygous genotype persists. Then, in comes a new gene from somewhere else in the genome. It produces protein product "C". Suppose that, ...

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by wildfunguy
Sun Sep 29, 2013 2:50 pm
Forum: Cell Biology
Topic: Do chromosomses ever get competitive?
Replies: 9
Views: 7385

Re: Genetics Hard problem!

... BA/ba (albino), b+/ba (brown) So in the crossover, since crossover was done in between the two alleles, 100+34/200= 67amu. (wrong) Consider heterozygous parent contribution (second parental allele pair is ba): Parent allele pairs are B+ (black) and ba (white). Cross-over allele pairs are ...

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by Cat
Sun Jul 07, 2013 10:04 pm
Forum: PDF & Doc Files
Topic: Genetics Hard problem!
Replies: 2
Views: 4526

Re: Question about blood types

... However with regards to your question I believe Rhesus negative is controlled by a recessive gene. Therefore your parents are likely to be heterozygous for Rh+. By chance you have seemed to have received two Rh- genes from your parents, one from each. As a result your parents can be phenotypically ...

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by Amphibitile
Sun Jun 23, 2013 4:48 pm
Forum: Human Biology
Topic: Question about blood types
Replies: 4
Views: 2095
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