Reproduction
You have 23 chromosome pairs; why do you have pairs?
Because you have 2 parents (2 makes a pair)
What do the letters on the outside of the punnett square represent?
Parent Genotypes
The genotype is the combination of what?
alleles/genes
_______ makes up DNA and DNA makes up chromosomes.
Genes
If purple is a recessive color, how can 2 purple flowers have a yellow offspring?
They can't.
_______ results in genetically identical offspring. How many parents?
Asexual reproduction; 1
If webbed toes are recessive, show a cross between a web-toed parent and a heterozygous non-web-toed parent.
I will draw it for you.
Human parents give each offspring 23 _______.
chromosomes
Why does selective breeding require 2 parents?
Without variation and 2 parents, there would be nothing to select and breed.
_______ reproduction increases genetic variation because _____ parents contribute to the offspring’s total of 46 chromosomes when the egg meets the ______.
Sexual; 2; sperm
My chocolate lab met a GIIRRRRLLL at a friend’s house this weekend. She is a chocolate lab also. If they are both heterozygous for chocolate color, and red color is recessive, what is the probability that they could have a puppy with red coloring?
25%
When an offspring receives a dominant alleles from one parent and a recessive alleles from another, what is that genotype called?
heterozygous
Can you look more like a grandparent than a parent? How?
Yes, even though you cannot receive genes directly from a grandparent, genes that are passed from your grandparent to your parent could then be passed to you. If your parent has more dominant phenotypes but still carries recessive genes and the grandparent you look more like has more recessive phenotypes, you could receive more recessive phenotypes as well.
How can some offspring have identical DNA?
If they are a result of asexual reproduction, then all of the offspring of the one parent would have an exact copy of the parent's DNA.
Draw a punnett square that would show results of 2 heterozygous parents.
I will draw it on the board.
phenotype
What is my favorite dog's name?
Copper aka Bubba
Which type of reproduction has more genetic diversity? Why?
Sexual, because the offspring gets a random half of it's DNA from 2 different parents instead of continuously passing on an exact copy of DNA like in asexual reproduction.
If dad is homozygous long neck (LL) and mom is heterozygous long neck (Ll), what are the possible genotypes of their offspring?
LL and Ll
This type of trait only shows if you have 2 of the alleles representing that trait.
recessive
How can an organism have a phenotype or trait that neither parent shows?
Each parent was heterozygous and they both gave their offspring a recessive allele.