Mendel's Concept of Inheritance Flashcards Preview

Biology Unit 2- Genetics > Mendel's Concept of Inheritance > Flashcards

Flashcards in Mendel's Concept of Inheritance Deck (12)
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1
Q

pure breed

A

A population that is inbred enough that offspring are always very 
similar to their parents

2
Q

Hybrid

A

when you cross two pure breeds

3
Q

Mendel and the Pea

A

He bred two pure breeds and found that all had one trait. f2 generation had a bit of another trait but still mostly one trait. F2 generation had a 3:1 ratio of traits.

4
Q

When two pure breeds cross, it is a

A

100 percent dominant but heterozygous. when you breed again, this has F2 generation of 3:1 ratio

5
Q

Mendel’s interpretation

A

he said that each parent had 2 factors for yellow and 2 for green. each factor is distributed to offspring from each parent RANDOMLY. offspring are hybrid but yellow is dominant so all have yellow

6
Q

Principle of segregation

A

In adults genes exist in pairs, which 
segregate randomly when gametes are formed and then 
recombine into pairs at fertilization. In other words, a sperm or 
egg (haploid) has only one copy of each gene, while a (diploid) 
adult has two copies.

7
Q

Principle of Dominance

A

If an individual is heterozygous (has 
two different versions of the same gene), then one version will dominate and the other will disappear (recede in Mendel’s terms). The recessive version of the gene will only show up as a trait 
when an individual inherits two copies of the recessive, or is 
homozygous recessive.

8
Q

Genotype:

A

combination of alleles (YY, Yy or yy)

9
Q

phenotype

A

trait (blue or green eyes)

10
Q

heterozygous genotype

A

Hybrid. Two different alleles.

11
Q

“factors”

A

genes

12
Q

monohybrid cross

A

mating between hybrids for one gene using (Yy, Yy)