Gregor Mendel's Experiments

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In the cross BB x bb the percent of offspring in the F1 generation that will have the same genotype as the parents is:

0%

The second generation phenotypes resulting from the cross of true-breeding monohyrbrid pollination will display a cross ratio of:

1:3

How many combinations of genotypes are possible for the coat coloration of rabbits which is governed by three alleles

6

In considering the cross from YyRr and YyRr, the ratio of traits will be ______ yellow smooth, __________ yellow wrinkled, __________ white smooth, and ____________ white wrinkled.

9, 3, 3, 1

In considering this cross (YyRr and YyRr), the phenotype ratios of F2 generation will be_________.

9:3:3:1

When neither of the genes are dominant or recessive, they are said to be:

Incomplete dominant alleles

Which of these paired genes is homozygous?

PP and pp

In a dihybrid cross, the F2 will have nine genotypes, but only four phenotypes because the _____________ genes cause the ____________ traits to mask the ___________ traits.

heterozygous, dominant, recessive

A family has seven sons. The chance that their eighth child will be a daughter is:

practically none

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in a ratio of 3:1. The allele are designated (R&r) receptively. What is the probably genotypes of the wrinkled seeds which produced (F1)?

rr only


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