# What is the probability of a child with a homozygous recessive trait?

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## What is the probability that the child will be homozygous recessive?

If two heterozygotes are crossed, the probability that an offspring will be homozygous recessive is 25% or 0.25.

## What are the chances of a child being homozygous recessive for a trait if both parents are heterozygous?

When both parents are heterozygous for a trait, two out of four children on average will also be heterozygous, one out of four will receive two dominant alleles — WW — and be homozygous dominant, and one out of four will receive two recessive alleles — ww — and be homozygous recessive.

## Which trait is homozygous recessive?

Being homozygous for a particular gene means you inherited two identical versions. It’s the opposite of a heterozygous genotype, where the alleles are different. People who have recessive traits, like blue eyes or red hair, are always homozygous for that gene.

## How do you find the probability of a recessive allele?

Subtract the percent chance for the dominant trait from 100 to get the percent chance that an offspring will display the recessive trait. For example, 100 – 50 = 50, so there is a 50 percent chance of an offspring having blue eyes.

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## How can two homozygous parents have a heterozygous child?

For example, if one parent is homozygous dominant (WW) and the other is homozygous recessive (ww), then all their offspring will be heterozygous (Ww) and possess a widow’s peak.

## What is the probability of having a heterozygous offspring?

The chance of either parent being a heterozygote is 1/4, as calculated above. Then, the probability that both parents are heterozygotes, and the probability that two heterozygotes will have a heterozygous child, is 1/4 x 1/4 x 1/2 = 1/32.

## What is the chance that a heterozygous parent passes on a recessive allele?

A person with a single gene disorder has a 50/50 chance of passing the mutated allele to a child who will become a carrier. If both parents have a heterozygous recessive mutation, their children will have a one-in-four chance of developing the disorder. The risk will be the same for every birth.

## What is the percent chance of having a heterozygous genotype?

Both parents are aa: All of their children will be aa as well (homozygous for aa). One parent is Aa and another parent is Aa: Their child has a 25 percent chance of being AA (homozygous), a 50 percent chance of being Aa (heterozygous), and a 25 percent chance of being aa (homozygous)

## How is a homozygous recessive trait written?

When a particular gene has identical alleles (versions) of chromosomes inherited from both parents, the gene is homozygous. A homozygous trait is referred to by two capital letters (XX) for a dominant trait, and two lowercase letters (xx) for a recessive trait.

## What is the percentage of homozygous recessive offspring quizlet?

In a cross of two homozygous parents, 25% of the offspring should be homozygous recessive. Incomplete dominance occurs when both alleles are expressed equally in the phenotype of the heterozygote.

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## Is P or Q recessive?

In the simplest system, with two alleles of the same locus (e.g. A,a), we use the symbol p to represent the frequency of the dominant allele within the population, and q for the frequency of the recessive allele.