Is DD a homozygous?

Sally’s genotype is “dd”, so she is also considered homozygous. Susan’s genotype is “Dd”, so she is considered HETEROZYGOUS (has two different alleles for a specific gene). Although Susan has both the allele “D” to make dimples and the allele “d” in her genotype, her phenotype is the presence of dimples.

What does DD mean in genotype?

Dd = tall (heterozygous)

Is homozygous dominant dd?

Physical Traits and Appearance



Having dimples on the cheeks is a dominant trait, with the homozygous DD gene causing them. However, the recessive trait is distinguished by the symbol dd; individuals with this homozygous gene will not have dimples.

Is DD heterozygous recessive or dominant?

Heterozygous means an individual has the alleles for both the recessive and dominant traits, but only the dominant is expressed, so a heterozygous (Dd) and a homozygous dominant (DD) individual will not have the recessive disorder, because any dominant allele suppressed the expression of the recessive allele.

Is White homozygous or heterozygous?

Heterozygous means that an organism has two different alleles of a gene. For example, pea plants can have red flowers and either be homozygous dominant (red-red), or heterozygous (red-white). If they have white flowers, then they are homozygous recessive (white-white). Carriers are always heterozygous.

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Which genotype is purebred?

Answer Key



Purebred – Also called HOMOZYGOUS and consists of gene pairs with genes that are the SAME. Hybrid – Also called HETEROZYGOUS and consists of gene pairs that are DIFFERENT. Genotype is the actual GENE makeup represented by LETTERS.

Is AA homozygous dominant?

Homozygous means that both copies of a gene or locus match while heterozygous means that the copies do not match. Two dominant alleles (AA) or two recessive alleles (aa) are homozygous. One dominant allele and one recessive allele (Aa) is heterozygous.

Is CC a heterozygous or homozygous?

A person’s genotype with respect to hair texture has three possiblilties: CC, Cc, or cc. So to review some vocab, homozygous means having two of the same allele in the genotype (2 big or 2 little letters — CC or cc). Heterozygous means one of each allele in the genotype (ex: Cc).

Is EE dominant or recessive?

There are special term that are used to indicate each of these genotypes. Homozygous dominant, means that the organism has two copies of the dominant allele, in this case EE. Combination A is an example. Heterozygous means that the organism has one dominant and one recessive allele: Ee.

Can heterozygous be dominant?

If the alleles are heterozygous dominant, the faulty allele would be dominant. In such a case, the person may or may not be affected (compared to homozygous dominance where the person would be affected).

What are examples of homozygous?

Homozygous examples

  • Eye color. The brown eye color allele is dominant over the blue eye allele. You can have brown eyes whether you’re homozygous (two alleles for brown eyes) or heterozygous (one for brown and one for blue). …
  • Freckles. Freckles are tiny brown spots on the skin. …
  • Hair color. Red hair is a recessive trait.
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How do you determine if a plant is homozygous or heterozygous?

Homozygous plants have two identical copies of a single gene. Heterozygous plants have two copies of a single gene, but those copies are alleles, or different versions of that gene. The second type is heterozygous. Plants that are heterozygous for a particular gene have one copy each of two different alleles, ‘Aa’.

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