What represents a homozygous recessive genotype?
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 probability of an offspring having the YY genotype?
In another example (shown below), if the parent plants both have heterozygous (YG) genotypes, there will be 25% YY, 50% YG, and 25% GG offspring on average. These percentages are determined based on the fact that each of the 4 offspring boxes in a Punnett square is 25% (1 out of 4).
What are the 2 types of traits which are passed from parents to offspring?
The two types of alleles are dominant and recessive. A dominant allele is written as a capital letter, and a recessive allele is written as a lowercase letter. If a gene pair contains a dominant allele, then the offspring will show this dominant trait.
What percentage of intelligence is inherited?
These studies suggest that genetic factors underlie about 50 percent of the difference in intelligence among individuals.
Are older siblings more intelligent?
A new study by researchers at the Universities of Houston, New South Wales and Sheffield have revealed that older siblings are smarter than younger ones – and even revealed why.
Are older siblings more successful?
Oldest children are the smartest, research shows Research published in the Journal of Human Resources found that firstborn children outperform their younger siblings on cognitive tests starting from infancy — they are better set up for academic and intellectual success thanks to the type of parenting they experience.
What are the advantages of being the oldest child?
9 Benefits to Being the Oldest in a Family
- You set the precedence for every other child.
- You never have hand me downs.
- You never have to share a room.
- You are given more responsibility.
- You have more childhood pictures.
- You are never pushed around.
- You are a role model.
- You have your parents all to yourself.
Which child is the most successful?
First-born kids tend to be leaders, like CEOS and founders, and are more likely to achieve traditional success. Middle-born children often embody a mix of the traits of older and younger siblings, and they’re very relationship-focused.
Is it better to be oldest or youngest child?
Being the youngest child is the best because they get perks that the older sibling(s) didn’t have. They also get more attention from their parents when their older sibling(s) go to college. The youngest sibling is spoiled because they are the parent’s last “baby” in the house so they often get whatever they want.
Is the middle child most likely to be depressed?
They explain that one study in 2003 found that middle children were more likely to develop depression. However, a follow-up study in 2016 found that oldest children seem to be more likely to develop mental illnesses such as depression.